Hyfin Vent Chest Seal Twin Pack
Built for real-world emergencies, the HyFin® Vent Chest Seal Twin Pack is a life-saving addition to any IFAK, trauma kit, or go-bag. Designed for tactical responders, EMS, military medics , and prepared civilians, this compact chest seal system provides critical treatment for open chest wounds and tension pneumothorax—one of the most life-threatening injuries in trauma care.
Each seal features a patented 3-channel vent system that prevents airflow into the chest cavity while allowing trapped air and fluids to escape, reducing the risk of tension pneumothorax. With advanced adhesive technology , they stay in place even on sweaty, hairy, or dirty skin—because trauma doesn’t wait for clean conditions.
Whether you’re on patrol, in the backcountry, or 20 miles down a trail, the HyFin® Vent Chest Seals give you the tools to act when every second matters.
"A prudent person foresees danger ahead and takes precautions. The simpleton goes blindly on and suffers the consequences. - Proverbs 27:12"
Dual Seals for Dual Threats
Treat both entry and exit wounds or multiple penetrating injuries
Reliable Venting
Patented 3-channel design maintains airflow escape even if partially obstructed
Rugged, Field-Tested Packaging
Red-Tip Technology® makes opening quick and stress-free
Easy Application
Large red tab allows for rapid deployment and vent burping if needed
Optimized for Trauma Kits
Lightweight and compact for IFAKs, rigs, packs, and more
Trusted Worldwide
Used by military and first responders in the harshest environments
The numbers, flat and honest.
| Device Size | 6 in. x 6 in. (excluding tab) |
|---|---|
| Packaged (Folded) | 7.5 in. x 4.5 in. x 0.25 in. |
| Packaged (Unfolded) | 7.5 in. x 9 in. x 0.13 in. |
| Weight | 2.5 oz |
| U.S. Patent | 7,504,549 |
WHY YOU’RE BUYING FROM STAY READY.
We aren’t the Amazon of survival. We’re a small, opinionated shop that carries gear we’d stake our own lives on — and we back every piece with real support.
Curated
Every brand we carry has been vetted in the field by our team. If it doesn’t pass our 30-day use test, we don’t stock it.
Authenticated
Factory-direct from authorized dealers. No grey-market, no refurb, no knockoffs. Your warranty is real.
Supported
Real humans on phone, text, and email — seven days a week. We carry this gear ourselves and we stand behind it.
American
HQ in California. Orders ship from our US warehouse. US-based customer care.
TACTICAL MEDICAL EQUIPMENT
Built by military medics. Makers of the U.S. Army's official combat tourniquet.
North American Rescue was founded in 1996 in Greer, South Carolina by seasoned military medics who saw the gaps in field medical equipment firsthand and built the kit to fill them. Their patented Combat Application Tourniquet (CAT) has been the Official Tourniquet of the U.S. Army since 2005, and is credited with cutting battlefield extremity-bleed mortality by 85%. NAR's gear is now standard issue across U.S. military units, tactical EMS, and law enforcement worldwide — chest seals, decompression needles, IFAKs, and the trauma kit that probably saved someone's life today.
- Founded in 1996 in Greer, South Carolina
- Built by seasoned military medics
- Maker of the CAT — Official Tourniquet of the U.S. Army since 2005
- CAT credited with 85% reduction in extremity-bleed mortality
- Tourniquets, chest seals, decompression needles, IFAKs
Answers, straight up.
Product-specific questions on the left. Shopping with SRO on the right. Both open-ended — hit us if we missed one.
Do I need training to use this?
Owning trauma gear is not the same as knowing how to use it. Tourniquets, chest seals, airways and wound packing all have real technique and real consequences when applied wrong. Take a Stop the Bleed or TCCC-based course before you need one — the equipment is the easy part.
Does this expire?
Sterile items — gauze, dressings, chest seals and hemostatics — carry expiration dates printed on the packaging. Tourniquets do not expire but should be replaced after any live application or if the webbing, windlass or clip show wear. Check your kit annually and rotate what has aged out.
Is this HSA or FSA eligible?
Many first aid and trauma supplies qualify as eligible medical expenses under HSA and FSA plans. Eligibility depends on your plan administrator, so keep your receipt and check with them before assuming coverage.
How long does shipping take?
Most in-stock orders are processed within 1 to 3 business days, not counting weekends and federal holidays. Special-order, dealer-direct, custom, and LYNX Survival Systems orders can take longer. Lead times shown on product pages are estimates, not guarantees.
Typical carrier transit after that: Economy 5 to 7 business days, Expedited 2 to 3, Overnight 1. These are carrier estimates, not guarantees. Some items, such as lithium batteries, aerosols, and safety matches, may be limited to ground shipping.
Free Economy shipping on qualifying orders over $150 to the contiguous US, on eligible products. Oversized, heavy, freight, hazardous-material, dealer-direct, custom-built, and special-order items may be excluded. Oversized and freight items, such as rooftop tents, recovery equipment, and Pro Eagle products, may carry extra shipping charges. If extra charges apply, we'll let you know before the order ships.
Some items ship directly from the manufacturer or a supplier partner on their own schedule, so an order can arrive in more than one package with more than one tracking number. Full details: Shipping Policy.
What’s your return policy?
You have 30 days from receiving your order to request a return on eligible items. Email info@stayreadyoutdoors.com with your order number, the item, and the reason, and wait for return authorization before you ship anything back. Returns sent without authorization may be refused.
Items must come back in like-new condition: unused, unmodified, unworn, unwashed, and free of odors, dirt, stains, pet hair, and damage, with all original packaging, manuals, accessories, and tags, plus proof of purchase.
For standard parcel items, you pay return shipping unless the return is due to our error, shipping damage, or a verified defect. If we provide a prepaid label, its cost may be deducted from your refund. For oversized, freight, dealer-direct, and special-order items, you pay return shipping unless the item arrived damaged, defective, or incorrect. Original shipping charges aren't refunded. Some items may carry a restocking fee of up to 15%, and we'll tell you during authorization.
Some items are fulfilled by third-party suppliers and follow that supplier's return policy, so eligibility, refund timing, return shipping, and restocking fees may differ.
Approved refunds go to your original payment method. Allow up to 10 business days after approval, and your bank may take longer to post it. Full details: Return & Refund Policy.
What can’t I return?
These can't be returned or refunded, except where the law requires it:
- Engraved, personalized, customized, and built-to-order products, and special-order products obtained specifically for you
- LYNX Survival Systems survival kits, custom IFAKs, and custom medical kits
- Agency, government, organizational, and contract-built orders
- Gift cards, and sale or clearance items marked final sale
- Food, drink, and other perishable products, including emergency food
- Personal care, hygiene, and beauty products
- Hazardous materials, and flammable liquids or gases
- Opened or used medical products
- Opened water treatment or purification products with broken factory seals
- Anything marked non-returnable on its product page
For built-to-order, custom, and special-order items, exceptions may be made only for verified manufacturing defects, shipping damage, or fulfillment errors. For food and drink, replacements may be issued only for verified manufacturing defects or shipping damage reported within 5 days of delivery, with photos.
Not sure whether an item qualifies? Email info@stayreadyoutdoors.com before you order.
Do you ship outside the contiguous US?
Alaska, Hawaii, Puerto Rico, Guam, and other U.S. territories aren't eligible for free shipping, and extra freight charges may apply. If your order needs a shipping quote, we'll contact you before it ships. If you decline the quote, the order may be canceled and refunded. APO/FPO addresses are also excluded from free shipping.
International shipping is available on select products and destinations, and some products may be restricted from international shipping. You're responsible for import duties, taxes, customs fees, brokerage fees, and meeting your country's import rules.
Full details: Shipping Policy.
My package arrived damaged. What now?
Inspect your order when it arrives. If anything is damaged, defective, or wrong, email info@stayreadyoutdoors.com within 7 days of delivery (5 days for food and drink) with your order number, a short description, and photos of the item and the packaging.
You don't pay return shipping on items that arrived damaged or wrong, or with a verified defect. Some items fulfilled by third-party suppliers follow that supplier's policy instead. Reporting after 7 days may limit our ability to pursue a claim with the carrier, and while we may help with a carrier claim, approval is up to the carrier.
Package lost or never arrived? Contact us within 7 days of the expected delivery date. For freight deliveries, inspect the shipment before you sign and note any visible damage on the carrier's delivery receipt.
Can I talk to a human before buying?
Yes. Call (562) 294-6269, Monday to Friday, 8:00 AM to 4:00 PM Pacific time, or email info@stayreadyoutdoors.com. We reply within one business day.
We'd rather talk you out of a kit that doesn't fit your mission than sell you the wrong one.
Do you offer a military/first-responder discount?
Yes. Current and former U.S. military, military spouses and dependents, and first responders, including law enforcement, fire, and EMS, can save up to 10% on most of our products through GovX ID.
Verify on our GovX discount page and you'll get a single-use code to enter at checkout. For later orders, log in with GovX ID for a new code (limit one code per day). The GovX code can't be combined with other discounts.