For Refilling 1LB Green Bottle Refillable Propane Tank- propane refill adapter is estimated to recycle-use over 6000 times, It allows you to fill 1lb refillable propane cylinder from 5-40lb(QCC-1) propane tanks. Safe to Use- Air-tight fittings workmanship.100% brass features pliable, durable, corrosion-resistant, and rust-free. PA plastic part is solid and non-toxic. So this propane tank adapter is heavy duty and reliable. Money Saver- With just one small propane tank refill adapter, you can save up to 6 USD per gallon by refilling the cylinder rather than exchanging a 1lb propane tank. You can get 3 gallons of refilled propane with the cost of one 1lb tank(1 gallon/lb). Not to mention you can use the adapter over 6000 times. Fits for 5-40LB and 1LB Propane Tanks- Inlet QCC Type 1, perfect for 5-40lb propane tank. Outlet 1lb propane tank connection. Propane refill adapter for 1 lb. tanks is excellent to use in an emergency or in ordinary. Say goodbye to the large investment into a lot of small propane tanks. (Tips: it is recommended to refill the propane tank to 80% to avoid air pressure change since temperature changes. Easy to Use- Refill a propane tank in just 1 minute. It refills the propane tank through air pressure. Before use, it is recommended to chill the 1lb propane tank for 15 minutes. Please note to refill outdoor and far away from fire.