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? .