Versatile In line Non Return Valve for Back Flow and Odour Control

Pumps and Valves
Pumps and Valves


The patented WaStop® inline check valve has been the innovator and industry leader since its inception in 2002. WaStop excels at preventing backflow, flooding, and sewage odor spread in pipe networks. It can be inserted into almost any existing pipe.

Unlike any other check valve available today, WaStop® can be mounted horizontally, vertically, on an inlet, outlet, in a chamber, or utilizing flanges. Installation is a breeze!

For over 8 years WaStop has been leading with the lowest headloss in the industry.

The secret to WaStop®'s effectiveness is its specialized Memory Membrane, inserted inside either stainless steel or pvc pipes depending on the application. Memory Membrane is constructed of a specially formulated blend of polyurethane which gives it exceptional shape retention and chemical resistance. This ensures WaStop® always opens when needed, but then immediately seals to prevent backflow.

Advantages of WaStop®

  • Installed for over 10 years worldwide with 100% satisfaction Superior construction materials
  • Extremely low head loss
  • Low life cycle cost and easy installation
  • No moving parts - virtually maintenance-free
  • Many dimensions 40 - 1500 mm std & non-standard pipes
  • Stops liquids, gases, odours, insects and small animals
  • Many installation options - vertical to horizontal
  • The ORIGINAL inline check valve - leading development