Quick Coupling: 1) Type: A, B, C, D, E, F, DC, and DP; ... /4", 2", 2-1/2", 3", 4",5"&6 brass quick Couplings are used in a wide variety of applications ... dry bulk handling, agricultural, and water, etc. 1) Material: brass 2) Type: A, B, C, D, E, F, DC, and ... 1-3/4",2",2-1/2",3",4" ,5"&6"4) Feature: (1) Precisely machined for accurate fit, ... P. S. We are the qualified member of NFPA. Brass Quick Coupling