Reliable and leak-proof design This refill adapter is made of high quality materials and features a leak-proof design for safe, reliable use without worrying about gas leaks. Universal compatibility Designed to work with most propane tanks, it lets you refill smaller 1 pound tanks from larger 20 pound tanks, making it suitable for camping, barbecues, and gas grills. On/off control valve An on/off control valve lets you easily control propane flow during refilling, providing full control and reducing the risk of leakage. Convenient and cost-effective This two-piece set enables at-home refilling, saving money on disposable tanks and reducing waste. Practical use scenarios - Refill 1 lb cylinders for camping stoves and portable grills at home or at the campsite. - Top up small tanks for backyard barbecues or camping trips. - Maintain fuel supply for RVs, emergency kits, or other portable cooking setups.