Features 1. Easy filling: The 90 degree elbow design makes it easier for gas to flow into the small gas cylinder. Simply connect it to the large can and can to refill within 1 minute. 2. Upgrade design: Equipped with a propane switch control valve to prevent gas leakage when connecting gas cylinders. You can easily and safely control the refilling process. 3. Quick monitoring: Quickly check the remaining gas in the large tank to avoid inconvenience caused by insufficient gas during the filling process. 4. Safety structure: corrosion-resistant solid brass provides better sealing effect. In addition, the built-in safety function can effectively prevent the danger of overfilling gas cylinders. 5. Easy to use: You can easily refill a 1-pound gas cylinder multiple times without the need for tools. Help you save on the cost of purchasing new green propane cylinders. Specification Material: Solid brass Entrance: QCC1 or POL Type 1 Export: 90 degree elbow, 1 inch x 20 inner disposable cylindrical thread Other: 1 or 4 "propane switch control valve and 3-color coded dial Function: Inflate a 1-pound gas cylinder with a large gas cylinder to save the cost of purchasing a new green propane cylinder. Color: Yellow Size: 16 x 5.5 x 6 cm Weight: 270 g Package Include: 1x Top-Rated Propane Refill Elbow Adapter with Tank Gauge