... Check Valve ( in Vertical or in Horizontal ) DIN, ANSI, JIS, BS Standard DN20-DN150 ( 3/4"- 6" ). EPDM Rubber. Working Pressure ... the Top Side 1. PVC Check Valve DIN, ANSI, JIS, BS Standard DN20 ( 3/4" ) - DN150 ( 6" ) EPDM Rubber. BSPT or ... NPT2. PVC Check Valve with Flange DIN, ANSI, JIS, BS Standard DN20 ( 2" ) - DN150 ( 6" ) EPDM Rubber. SpecificationWorking PressureCarton SizeCartonSize ...