Specification: Item Type: Plastic Hose Quick Connector Product Size: Connector A: 5 x 2.5 x 2cm / 2 x 1 x 0.8in Connector B: 5 x 1.6 x 1.6cm / 2 x 0.6 x 0.6in Product Material: Plastic Weight: 17g / 0.6oz Package List: 2 x Quick Connector Features: Shut Off Device: This connector is equipped with a check valve to prevent leakage when disconnected. Food Grade Plastic: Use these high-quality, food-grade quick disconnects on your gas tube and beer lines. Quick Replacement: Makes changing connectors on gas systems or beer lines very easy. 5/16 Barb: This hose coupling connector has a 5/16in barb, compatible with 5/16in inner diameter hose. Uses Include: On the gas system, remove your tank and regulator from the manifold. Easily switch between ball lock, pin lock, or commercial taps on the beer line. Use for back pressure bottle connection to your gas line.