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Here's how to fit a big dirty 160 mm double anti back flow sewer valve to keep the town's nastiness out of our manhole in case of flood!
Sewerage maintenance. underground drainage
Links to buy things:
110 mm anti flood valve
amzn.to/3uBwNhO
160 mm anti flood valve
amzn.to/3b694yB
to make a double valve you can put two in line.
you may also need a slip coupling
110 mm amzn.to/3b5Dstg
160 mm amzn.to/33n6uA2
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sewer flood valve (Check Size): amzn.to/2ZHeQkL