Features:-The 90 degree elbow design helps gas flow smoothly to smaller cylinders.-Equipped with an on-off control valve to minimize gas leakage during cylinder connection, allowing safe and controlled refilling.-With color gauge, it can quickly evaluate the remaining gas in the large tank to avoid insufficient gas level during the refilling process.-Made of solid brass material, it has stable performance, ensures excellent sealing and long service life.-The adapter is used to fill a small tank of propane from a large tank. It is perfect for barbecue, camping, party, heating and other outdoor activities.How to refill propane gas?Step 1: chill a 1-pound gas cylinder in a freezer, which has a lower vapor pressure than a bulk tank.Step 2: turn the 5-40 pound pr.