While the above incident in Beaconsfield may be considered a one-off, Winnipeg plumbing companies say a good backwater valve can prove instrumental in preventing a surge of water or solid waste along the plumbing system from entering your local plumbing, especially during heavy rains. Many backwater valves are rated to resist 43 psi at 23OC. By comparison, the city's water main pressure runs at 30 psi at peak hours.
http://www.bisonplumbing.com/winnipeg-plumbers-urge-fitting-backwater-valves-to-avoid-toilet-blast/
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