Hiwa Fittings (www.hiwaflow.com) is a professional pipe fitting production dept. of Tianjin Huihua Valve Industry Co., Ltd. (www.hiwa.cn). We are CE, WRAS, SGS and ISO9001 approved. Our main product line is as follows: 1) Ductile iron pipe fittings: Universal couplings Universal flange adaptors Restrained flange adaptors & couplings for PE/PVC pipes Dedicated flange adaptors and couplings for DI/STEEL pipes Quick flange adaptors for PVC/PE pipes Saddle clamps Repair ...