Series WaStop®

TheWaStop® check valve can be used to prevent sewer gas, effluent, sand or seaweed backflow into cellars or storm water drains. The WaStop® check valve can be used to protect against overflows in manholes, storm water drains, storm water tanks, sewage works, drainage pipes, culvert systems and ditches.

  • No mechancial parts
  • Stops the migration of dangerous sewer gases into living spaces or other occupied areas
  • Responds to very low inlet pressures
  • Self cleaning – minimal maintenance, completely smooth lower pipe.
  • Simple installation, even in existing pipes and chambers
  • Protects against flooding

The WaStop® check valve consists of two parts, the polyurethane sleeve (rubber membrane) and the pipe. The pipe is supplied with 304 stainless steel and also available with 316SS or plastic for specific applications. The sleeve simply folds up and out of the way with very little pressure to allow the flow to pass through the valve. Inversely, the sleeve is capable of resisting several metres of pressure in the opposite direction.

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dn outside diameter a length l
100 97 220
100 101 220
150 146 300
125 118 250
200 183 400
200 193 410
225 215 450
250 230 480
250 240 520
300 290 600
400 390 750
450 440 900
500 490 900
600 590 1200
700 690 1300
800 790 1500
900 885 1700
1000 985 1800
1200 1185 2250
110 110 220
160 160 300
75 75 125

TheWaStop® check valve can be used to prevent sewer gas, effluent, sand or seaweed backflow into cellars or storm water drains. The WaStop® check valve can be used to protect against overflows in manholes, storm water drains, storm water tanks, sewage works, drainage pipes, culvert systems and ditches. The WaStop® check valve can even be used for overflow from water towers and also protects against entrance of animals and insects.

All EVR products are guaranteed for one full year against defects resulting from faulty workmanship or materials. If any such product is found to be defective by reason of faulty workmanship or materials, upon written notice and return of the product, the defective product will be replaced by us free of charge, including the shipping charges for the replacement product. Claims for labour costs and other expenses required to replace such defective product, or to repair damage resulting from the use thereof will not be allowed by us. Our liability is limited to the price paid for the defective product. EVR Products shall not be bound by any warranty other than the above set forth unless such warranty shall be in writing. This literature is published in good faith and is believed to be reliable, however, EVR Products does not represent and/or warrant in any manner the above information and suggestions contained in this brochure. Data presented is the result of laboratory tests and field experience.