Zhejiang Taizhou Triunion Co., Ltd. As a member of Hongtu Group, is a union corporation, which specilize in producing & selling High Quality PVC Fittings, PVC Butterfly Valves, FRPP Ball Valve, PVDF Check Valve, PE Irrigation Fittings, PP-H Fittings, PP Compression Fittings, HDPE Fittings, SMC Composite Manhole Cover BS EN124 and Australian AS3996 Series Products with Hongtu Plastic Product Co., Ltd; Resin Chemical Co., Ltd; Yinyida Pipe and Fittings Co., Ltd.; Sanfa Plastic Co., Ltd.; Our PVC Pressure Fittings accord with ISO 4422-2: 1996, GB/T 10002.1-1996, GB/T 10002.2-2003 and DIN 8063 and HDPE Fittings with SDR17 SDR11 PE100 for water supply accord with GB/T 13663-2000 standard, PP Compression Fittings accord with UNI 9561-2, DIN 8076, ISO 14236 standard, PP-R Pipes and Fittings for Water Supply accord with DIN 8077 & DIN 8078 standard, and PVC Butterfly Valves accord to DIN / ANSI / JIS standard, SMC Composite Manhole Cover accord with BS EN124-1994 & EN 20105-A03: 100 standa