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