Nozzle Check Valve - Silent Type, double flanged type, face to face acc.to EN 558-1 series 14 (F4), Body: ductile cast iron acc. to GGG50, Disc: Ductile Iron + EPDM, Stem: AISI420, Spring: SS-304, Diffuser: GGG50, inside and outside min 250μm fusion bonded epoxy powder coated. All materials in contact with the medium acc. UBA-KTW and Conform to DVGW W-270.