Backwater flaps RSK

Backwater flaps with EPDM sealing surface

Backwater flap with EPDM sealing surface for safe and maintenance-friendly protection of sewers, manholes and special structures in accordance with DIN19569-4 / Class 3.

Rückstauklappe Abwasser

Applications and benefits

  • A closure made of wastewater-resistant EPDM sealing material

  • Among other things, the EPDM sealing material has good chemical resistance to polar media and organic and inorganic acids and bases.

  • Reliably prevents the ingress of backed-up water in sewers, manholes and special structures

  • Resistant to weathering and ageing (UV radiation and ozone)

  • Waterproof up to a water column of 3m according to DIN19569-4 / class 3


  • Spigot end for insertion into on-site sockets

  • Wall flange for setting in concrete, welded all round

  • Smooth flange to DIN in PN6/PN10

  • Straight wall plate

  • Curved wall plate for manhole structures D >1500mm

Delivery program

  • Available in various pipe diameters

    • DN 100, 150, 200, 250, 300, 350, 400, 450, 500
    • others on request
  • Materials

    • Hot-dip galvanized steel
    • Stainless steel A2 1.4301
    • Stainless steel A4 1.4571