... Couplings are used in a wide variety of applications for petroleum handling, chemical processing, dry bulk handling, agricultural ... water, etc. 1) Material: brass 2) Type: A, B, C, D, E, F, DC, and DP.3) Size: 1/2 ... " ,5"&6"4) Feature: (1) Precisely machined for accurate fit, join fast and save effort. (2)Recess ... of groove and great resistance to vibration. 5) P. S. We are the qualified member of NFPA. ...