Quick Coupling: 1) Type: A, B, C, D, E, F, DC, and ... /2", 3", 4",5"&6 brass quick Couplings are used in a wide variety of applications for petroleum handling, chemical processing, dry ... /2",3",4" ,5"&6"4) Feature: (1) Precisely machined for accurate fit, join fast and save effort. (2)Recess holds ... ) P. S. We are the qualified member of NFPA. Brass Quick Coupling