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H2 Out SD303 Space Dryer Gun Safe Dehumidifier

$ 65.99

H2 Out SD303 Space Dryer Gun Safe Dehumidifier

The H2 Out SD303 Space Dryer is a compact, renewable stainless steel desiccant dehumidifier built to keep moisture, humidity, rust, and corrosion out of your gun safe, truck camper, refrigerator, or any other enclosed space up to 300 cubic feet. At just 3" in diameter and 3" long, it fits easily in the corner of any safe, including gun safes that hold up to 40 long guns, without taking up significant storage space. Unlike disposable desiccant packets that need to be replaced, the SD303 is fully renewable: when it's saturated, simply heat it in a conventional oven for 2-3 hours, and it's ready to go again, providing another 30-60 days of moisture protection per charge.

The SD303's self-contained, leak-proof stainless steel design makes it as practical as it is durable; there's nothing to spill, no wiring, and no power source required. Just place it inside your safe and let it work. It absorbs up to 3 oz. of moisture before needing a recharge, protecting firearms, ammunition, documents, and valuables from the rust, corrosion, mold, and mildew that moisture causes over time. If you need moisture protection for a larger space, a truck camper, storage room, or other enclosed area, the SD306 and SD309 models offer 600 and 900 cubic feet of coverage, respectively, in the same renewable stainless steel design. Made in the USA by H2 Out in Olympia, Washington.

If you have questions about which Space Dryer is right for your safe, call us at 800-207-2259, Monday through Friday, 8AM to 5PM PST.

Features

Protection

Absorbs moisture and humidity to prevent rust, corrosion, mold, and mildew
Ideal for gun safes up to 40 guns — covers spaces up to 300 ft³
Also suitable for truck campers, bathrooms, refrigerators, and other enclosed spaces

Design

Durable stainless steel construction — renewable and reusable
Self-contained and leak-proof
Small and portable — fits easily inside any safe or enclosed space
Made in the USA

Recharging

Renewable — recharge by heating in a conventional oven for 2-3 hours
Provides 30-60 days of protection per charge

Specifications

Dimensions: 3" OD x 3" L
Weight: 12 oz.
Moisture Absorbed: 3 oz.
Area Coverage: 300 ft³
Safe Capacity: Up to 40 guns

Frequently Asked Questions

Is shipping really free?

Yes. Free delivery is included on every safe we sell, anywhere in the lower 48 states. The specific delivery method depends on the safe's weight: small package delivery for under 150 lbs, curbside, or garage delivery for heavier safes. See full shipping details →

How long will this take to arrive?

Shipping timelines vary by product. Check the availability status at the top of this page for the estimated ship date. Once shipped, transit time typically runs 5–10 business days, depending on your location. You'll receive tracking when the safe leaves the warehouse. Safes under 150 lbs ship via UPS or FedEx Ground, no appointment needed. Safes weighing 150 lbs or more ship via freight (LTL); the freight carrier will contact you directly to schedule a delivery appointment once the safe reaches your local terminal.

Can you deliver it inside my house and bolt it down?

We don't provide inside delivery directly, but we work with third-party installers across the country who do. Here's how it works: call us at 800-207-2259 for a recommendation in your area, and we'll provide the names and phone numbers of installers we've worked with. You contact the installer directly to arrange pricing for delivery and installation. Once you've agreed on a price, place your order with us using the installer's address as the shipping destination. The installer receives the safe, inspects it, and schedules your final delivery appointment. Some installers prefer to pick the safe up directly from the freight terminal. See inside delivery details →

Will this fit through my doorway?

Check the product's exterior dimensions (listed above) against your narrowest passage, interior doorways, stair landings, and tight turns. Most people remove the safe from the pallet before moving it indoors, so the safe's actual dimensions are what matter for doorways. Standard interior doorways (30–32" clear) accommodate most residential safes, but measure before ordering. Call us if you're uncertain. See where to locate your safe →

Can I change the combination myself?

Electronic locks: yes; it takes about 30 seconds. Instructions are included with your safe. Mechanical dial locks: no, changing a dial combination requires a licensed safe technician. Important: attempting to change a dial combination yourself (or having an unlicensed locksmith do it) voids the lock warranty. A licensed safe tech maintains the warranty. See lock operating instructions →

What if it arrives damaged?

Call us immediately — while you have 24 hours to report damage, calling right away gets the claim filed faster. Take photos of the damage and packaging before moving anything. For minor cosmetic damage, we typically send touch-up paint plus a partial refund. For significant damage, we send replacement parts or arrange a full replacement. Order Protection (optional at checkout) speeds refund payouts to 48–72 hours vs. 30–60 days through standard freight claims; replacement safes ship on the manufacturer's normal timeline regardless. See receiving your safe →

What's your return policy?

We offer a 30-day return policy on unused, in-original-condition products. The return freight for a heavy safe is substantial, so we strongly encourage you to call us before ordering if you're unsure about fit or configuration. See full return policy →

Can I place my order by phone?

Yes. Call us Monday–Friday, 8am–5pm Pacific at 800-207-2259. You have two options: we can take the full order by phone (we pause the call recording before you read your card number, so payment info is never stored), or we can build your order and email you a payable invoice link so you can enter your own payment details securely.

Delivery Options

Please read all information on the type of delivery options you have for your order. The delivery of large safes is a very sensitive operation, and we supply this information to ensure you receive the product you ordered in the best condition possible for your delivery circumstance.

Types of Delivery Services (click the links below to skip to each section):

Small Package Delivery (under 150 lbs.)
Curbside Delivery (over 150 lbs.)
Fedex Freight Direct Basic (Includes Garage Delivery) (151 - 2000 lbs).
Safes Over 2000lbs
Inside Delivery (301 lbs & Above)
What Happens When You Place Your Order (All Products over 150 lbs.

Small Package Delivery (150 lbs. and Under)

Small package delivery is a free service offered by Safe & Vault Store. All packages under 150 pounds are delivered to your home or business front door via UPS or FedEx during normal business hours. There is no advance appointment call made. No signature is required.

Changing Your Address

Additional fees may apply if you need to change your address after your order has shipped. Please note that changing the address with FedEx is not guaranteed. You can create a FedEx Delivery Manager account, which allows you to change the shipping method to a FedEx Hold Location (ex: local Walgreens).

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Curbside Delivery (Over 150 lbs.)

Curbside delivery is a free service offered by Safe & Vault Store. Any shipments 151 pounds or larger shipments are delivered curbside via freight companies such as YRC, XPO, USF Reddaway, or other common freight carriers. The safes and vault doors are delivered on a wood pallet, curbside, where your driveway meets the street. The freight company will call to schedule an appointment within an 8-hour window. Need a smaller time window? See our Fedex Freight delivery options.

Freight companies will not deliver to a "dead end" street or Cul De Sac. Please see our Fedex Freight Direct Basic for additional options.
Remote areas require additional fees from the freight company. Please see our Fedex Freight Direct Basic for additional options.
“Limited access” locations will require additional fees from the Freight Company. Please see our Fedex Freight Direct Basic for additional options.
Some zip codes, including ferry points, are considered beyond service points from the servicing center and may result in additional charges. Please see our Fedex Freight Direct Basic for additional options.

What are “limited access” locations?

Airports or locations on airport property
Casinos
Camps, Carnivals, Fairs
Chautauquas, Churches, Mosques, Synagogues, Temples and Convents
Schools
Colleges and Universities
Medical/Urgent Care sites
Prisons / other correctional facilities
Construction Sites
Individual / Mini Storage Units
Mine Sites or Quarries
Golf Courses and Country Clubs
Nuclear Power Plants
Military Bases / Installations
Parks, Farms, and Ranches
Court Houses
Daycares
Hotels, Motels, and Resorts
Restaurants, Bars, and Night Clubs
Cemeteries
Outdoor flea markets
Retirement / Nursing Homes

What Happens When You Place Your Order (Products over 150 lbs.)

CLICK HERE to watch our video on “What to Do When Your Safe Arrives.”

Depending on the indicated lead time on your order, you will receive an email notifying you that your item has shipped with your tracking number.
After your item has shipped and arrived at your local terminal, the freight company will call you to schedule the delivery date.
The freight company will schedule a delivery appointment with you for the day of delivery only.
Freight companies will deliver between 8:00 a.m. and 5:00 p.m., Monday through Friday only.Because Mondays are heavy commercial delivery days, some terminals will avoid scheduling residential deliveries on Mondays. If you require a shorter time window, please see our Fedex Freight Direct Basic delivery options (2-hour window available).
You must be present or have someone inspect and sign for the product. There are no exceptions to this requirement.
If the packaging is damaged even slightly, note the damage on the receipt you receive and sign from the delivery staff. IMPORTANT NOTE: This is the only way to file a damage claim for a refund from the freight company and/or a replacement if your safe or vault door is damaged.

IMPORTANT NOTE: The delivery staff will not take your safe or vault door any further than curbside if this is the service you order. Freight companies will not deliver to your driveway on a dead-end road or Cul de Sac. They will only deliver to County, City, or State roads. They will not deliver to a congested downtown area without parking or a Doorman Condo or Apartment. Garage/Threshold Delivery or White Glove Inside Delivery are available for an extra charge if you need special delivery services. Please call 800-207-2259 for other delivery options if any of these cases apply to you.

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FedEx Freight Direct Basic (151 to 2000 lbs.) (Includes Garage Delivery)

$75.00

Trusted Fedex Branded Shipping
151 Pounds to 2000 Pounds
Delivery to garage only. This option does not include bringing the safe inside.
Smaller trucks access more locations closer to your home or business.
Flexible morning and evening 2-hour delivery windows
Order visibility by Web or Smartphone App
Regular notifications via text or e-mail
- Day of scheduling
- Day of delivery
- 30 minutes before arrival
This is the perfect option for those who live on a dead-end street, cul-de-sac, or remote area or have limited access to delivery.

Garage Delivery Requirements:

Please read these requirements before placing your order:

Access to an ‘overhead’ garage door is required and must be over pavement or concrete, no more than a 2% grade.
Excessively steep or long driveways are not included in this service; if this is your case, see Inside Delivery delivery options.
Drivers will not back the truck onto your driveway.
The driver may require help to push the product into your garage.
The driver will not remove the safe from the pallet.

Garage delivery is not guaranteed. It is not always available in all areas and is ultimately at the driver's discretion to complete. If the driver feels unsafe, the freight company will not be able to complete the garage delivery and will leave the safe at your curbside. We will refund you in full for the garage delivery if it cannot be completed. If you want to order garage delivery and are concerned that you might not meet the requirements, please call us at 800-207-2259 so we can determine the best option.

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Safes Over 2000 lbs.

Our trucks with liftgates can only handle safes up to 2000 pounds. Safes over 2000 pounds require a forklift or loading dock on site to receive them. If you do not have either of these items, we can recommend a company in your local area that can deliver your safe inside.

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Inside Delivery

Safe & Vault Store offers inside delivery options depending on the weight of the safe, whether there are stairs, and whether you require bolting the safe down. Please call us at 800-207-2259, and we can help you determine the best inside delivery option for you.

PLEASE CLICK HERE TO READ ADDITIONAL TERMS & DISCLAIMER FOR INSIDE DELIVERIES IF YOU ARE CHOOSING THIS OPTION

Back To The Top

What Happens When You Place Your Order (Products over 150 lbs.)

CLICK HERE to watch our video on “What to Do When Your Safe Arrives.”

Depending on the indicated lead time on your order, you will receive an email notifying you that your item has shipped with your tracking number.
After your item has shipped and arrived at your local terminal, the freight company will call you to schedule the delivery date.
The freight company will schedule a delivery appointment with you for the day of delivery only.
Freight companies will deliver between 8:00 a.m. and 5:00 p.m., Monday through Friday only.Because Mondays are heavy commercial delivery days, some terminals will avoid scheduling residential deliveries on Mondays.
You must be present or have someone inspecting and signing for the product. There are no exceptions to this requirement.
If the packaging is damaged even slightly, note the damage on the receipt you receive and sign from the delivery staff. IMPORTANT NOTE: This is the only way to file a damage claim for a refund from the freight company and/or a replacement if your safe or vault door is damaged.

H2 Out SD303 Space Dryer Gun Safe Dehumidifier

The H2 Out SD303 Space Dryer is a compact, renewable stainless steel desiccant dehumidifier built to keep moisture, humidity, rust, and corrosion out of your gun safe, truck camper, refrigerator, or any other enclosed space up to 300 cubic feet. At just 3" in diameter and 3" long, it fits easily in the corner of any safe, including gun safes that hold up to 40 long guns, without taking up significant storage space. Unlike disposable desiccant packets that need to be replaced, the SD303 is fully renewable: when it's saturated, simply heat it in a conventional oven for 2-3 hours, and it's ready to go again, providing another 30-60 days of moisture protection per charge.

The SD303's self-contained, leak-proof stainless steel design makes it as practical as it is durable; there's nothing to spill, no wiring, and no power source required. Just place it inside your safe and let it work. It absorbs up to 3 oz. of moisture before needing a recharge, protecting firearms, ammunition, documents, and valuables from the rust, corrosion, mold, and mildew that moisture causes over time. If you need moisture protection for a larger space, a truck camper, storage room, or other enclosed area, the SD306 and SD309 models offer 600 and 900 cubic feet of coverage, respectively, in the same renewable stainless steel design. Made in the USA by H2 Out in Olympia, Washington.

If you have questions about which Space Dryer is right for your safe, call us at 800-207-2259, Monday through Friday, 8AM to 5PM PST.

Features

Protection

Absorbs moisture and humidity to prevent rust, corrosion, mold, and mildew
Ideal for gun safes up to 40 guns — covers spaces up to 300 ft³
Also suitable for truck campers, bathrooms, refrigerators, and other enclosed spaces

Design

Durable stainless steel construction — renewable and reusable
Self-contained and leak-proof
Small and portable — fits easily inside any safe or enclosed space
Made in the USA

Recharging

Renewable — recharge by heating in a conventional oven for 2-3 hours
Provides 30-60 days of protection per charge

Specifications

Dimensions: 3" OD x 3" L
Weight: 12 oz.
Moisture Absorbed: 3 oz.
Area Coverage: 300 ft³
Safe Capacity: Up to 40 guns

Frequently Asked Questions

Is shipping really free?

Yes. Free delivery is included on every safe we sell, anywhere in the lower 48 states. The specific delivery method depends on the safe's weight: small package delivery for under 150 lbs, curbside, or garage delivery for heavier safes. See full shipping details →

How long will this take to arrive?

Shipping timelines vary by product. Check the availability status at the top of this page for the estimated ship date. Once shipped, transit time typically runs 5–10 business days, depending on your location. You'll receive tracking when the safe leaves the warehouse. Safes under 150 lbs ship via UPS or FedEx Ground, no appointment needed. Safes weighing 150 lbs or more ship via freight (LTL); the freight carrier will contact you directly to schedule a delivery appointment once the safe reaches your local terminal.

Can you deliver it inside my house and bolt it down?

We don't provide inside delivery directly, but we work with third-party installers across the country who do. Here's how it works: call us at 800-207-2259 for a recommendation in your area, and we'll provide the names and phone numbers of installers we've worked with. You contact the installer directly to arrange pricing for delivery and installation. Once you've agreed on a price, place your order with us using the installer's address as the shipping destination. The installer receives the safe, inspects it, and schedules your final delivery appointment. Some installers prefer to pick the safe up directly from the freight terminal. See inside delivery details →

Will this fit through my doorway?

Check the product's exterior dimensions (listed above) against your narrowest passage, interior doorways, stair landings, and tight turns. Most people remove the safe from the pallet before moving it indoors, so the safe's actual dimensions are what matter for doorways. Standard interior doorways (30–32" clear) accommodate most residential safes, but measure before ordering. Call us if you're uncertain. See where to locate your safe →

Can I change the combination myself?

Electronic locks: yes; it takes about 30 seconds. Instructions are included with your safe. Mechanical dial locks: no, changing a dial combination requires a licensed safe technician. Important: attempting to change a dial combination yourself (or having an unlicensed locksmith do it) voids the lock warranty. A licensed safe tech maintains the warranty. See lock operating instructions →

What if it arrives damaged?

Call us immediately — while you have 24 hours to report damage, calling right away gets the claim filed faster. Take photos of the damage and packaging before moving anything. For minor cosmetic damage, we typically send touch-up paint plus a partial refund. For significant damage, we send replacement parts or arrange a full replacement. Order Protection (optional at checkout) speeds refund payouts to 48–72 hours vs. 30–60 days through standard freight claims; replacement safes ship on the manufacturer's normal timeline regardless. See receiving your safe →

What's your return policy?

We offer a 30-day return policy on unused, in-original-condition products. The return freight for a heavy safe is substantial, so we strongly encourage you to call us before ordering if you're unsure about fit or configuration. See full return policy →

Can I place my order by phone?

Yes. Call us Monday–Friday, 8am–5pm Pacific at 800-207-2259. You have two options: we can take the full order by phone (we pause the call recording before you read your card number, so payment info is never stored), or we can build your order and email you a payable invoice link so you can enter your own payment details securely.

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H2 Out SD303 Space Dryer Gun Safe Dehumidifier

Frequently Asked Questions

What Happens When You Place Your Order (Products over 150 lbs.)

Frequently Asked Questions

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