90degree elbow design enables smooth gas flow to the small steel cylinder and allows quick and efficient filling in under 1 minute Propane onoff control valve prevents gas leakage during the connection of gas cylinders, delivering a safe and controlled filling process Builtin gas meter makes it easy to check the remaining gas in the large tank, helping to avoid running out during refills Solid brass construction provides durability and a secure, leak connection, with builtin safety measures to prevent cylinder overinflation Compatibility and function: this adapter connects a large propane tank to a small steel cylinder for efficient transfer, enabling controlled filling with a reliable seal Size and performance: designed for practical use between a large tank and a small cylinder, with features that prioritize safety, speed, and accuracy Material: solid brass for durability and long service life, engineered to maintain a tight seal under typical operating conditions Use scenarios Camping and outdoor cooking: fill camping stove or lantern cylinders quickly at the campsite from a larger propane tank Backyard grilling and patio heating: refill portable propane cylinders for grills or patio heaters without hassle Onsite refills for outdoor events or service support: efficiently restore gas supply to small cylinders where mobile refilling is needed