Kessel non-return valve KE73053 Staufix siphon DN 50 made of plastic Kessel double non-return valve Staufix siphon DN 50 made of plastic, with two automatically closing Klappen , one of them as a manually lockable emergency seal. With wall mounting, pipe odor trap and inlet funnel for drip water connection. Drain DN 50 horizontal for connection to HT-pipe according to DIN 19560. Backwater double lock: Staufix siphon Standard: DIN EN 13564 Type 5 Drain fitting: white Nominal width drain: DN 50 (DA 50 mm) Installation type: for dripping water