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With big opening for easy divertion. 
If there is a requirement to reroute the sewage from defective piping by bypassing the defective location and letting the sewage flow back into the pipeline behind this location, then bypass bags are the suitable solution due to their largest possible through-flow opening. Only three bypass bags are required for pipe diameters from 100 mm to 1,200 mm (4 inch to 48 inch). The outside thread enables the connection coupling to be freely selectable. Please note: With the sizes PDK 10/20 and PDK 20/50 the bypass adapters are fitted on the PE core with screws. With bypass bag PDK 50/120, the duct (also with outside threads) is directly in the PE core.
Product number: 1481004401
Videos "Bypass Bags"
Product number: 1481004401
Weight: 2.2 kg
Air requirement [l]: 27
Cylinder length: 48,5 cm / 19,09 inch
Diameter : 9,7 cm / 3,82 inch
Durchgang: 1x 2 1/2''
Pipe diameter : 10-20 cm / 3,94 - 7,87 inch
Test counterpressure [psi]: 72,5
Total length: 63,5 cm / 25 inch
operating pressure: 1,5 bar / 21,76 psi