Wafer Check Valve RSK 500 * without spring * PVC-U, PP, PVDF * DN 40 - DN 400 Wafer Check Valve FRSK 500 * with spring * PVC-U, PP, PVDF * DN 40 - DN 400 Ball Check Valve KRV 360 * ideal non-return valve * for vertical mounting * PVC-U, PP, PVDF * DN 10 - DN 100 Angle Seat Check Valve SRV 303 * ideal non-return valve * for horizontal and vertical mounting * PVC-U, PP, PVDF * DN 15 - DN 100 Aeration and Vent Valve BE 891 / 991 * aerates or vents depressurised containers * PVC-U, PP, PVDF * DN 10 - DN 80 Aeration Valve B 895 / 995 * vents depressurised containers * PVC-U, PP, PVDF * DN 10 - DN 80