.* Made of high quality material, durable and practical to use.* Airsoft propane refill adapter.* Store silicone oil and lubricate GBB with replenishing propane.* Leak-proof design: silicone oil mixes with propane when not in use. Silicone oil will not leak out of the stem.* Mixed propane with silicone oil: only when you press the stem, the silicone oil will come out with propane and go to GBB storage.* Using any standard camping-style propane fuel tank.* Easy to use. Durable to use.* Knurled surface allows a firm grip when tightening/loosening from the tank. Specifications:* Material: Metal * Color: As shown in the picture Package Contents:1 * Airsoft propane adapterNote:1. The actual colors of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.