... nipples; Body: 1/4"; Thread: NPT; Name: USA universal type couplers; Accepts Milton type, Truflate type, ARO ... size: 1/4", 3/8", 1/2"; Coupler type: Universal type, combo type, 3 in 1 type; Surface ... connections, air piping systems, air pressure equipments; The quick couplers include: Female thread socket, Male thread socket ... leakage, surface finishing and thread test. USA Universal Quick Couplings