Cornelius keg pin lock connector set. Set includes 1 - 2 pin connector for gas in hookup and 1- 3 pin connector for liquid out hookup. Both of these connectors have 1/4" barb fitting molded directly to the connector. No need for wrenches to connect barbed fitting. That means one less place for CO2 to leak out. Just push your 1/4'' i.d. hose on to the fitting and clamp with mini stainless steel hose clamp or plastic ratchet clamp.