... USA Truflate type couplers and plugs, Automotive type sockets and nipples; Shape: Female, male, push on hose barb; Name: USA Truflate type couplers and ... : 1 / 4", 3 / 8", 1 / 2"; Coupler type: Truflate type, automotive type; Surface treatment: Zinc plated; Working pressure: No more than ... plug, Hose plug, etc. Before delivery, all the sockets and plugs will be strictly tested for its working pressure ...