Instantaneous fire couplings are also used by utility companies and contractors who obtain water from mains hydrants.this specification are:- CP-IC-01 2 X 2 Ribbed Multi-serratedGunmetalAluminium AlloyS.S 304S.S 316BrassCP-IC-02 2 X 2 CP-IC-03 2 X 2CP-IC-04 2 X 1CP-IC-05 2 X2CP-IC-06 1 X 1