Cam&groove coupling Brass. Size:1/2"-- 6", Type: A,B,C,D,E,F,DC,DP, Qualified member of NFPA. ... ", 2 , 21/2", 3", 4", 5", 6" 5) Type: A,B,C,D,E,F,DC,DP/Brass6) Cast method available ... to customers’ requirements.10) We are qualified member of NFPA. quick lock coupling