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
https://amzn.to/3uBwNhO

160 mm anti flood valve
https://amzn.to/3b694yB

to make a double valve you can put two in line.

you may also need a slip coupling
110 mm https://amzn.to/3b5Dstg
160 mm https://amzn.to/33n6uA2

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sewer flood valve (Check Size): https://amzn.to/2ZHeQkL