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Air Release valve size for infra network.

Discuss Air Release valve size for infra network. in the USA area at PlumbersForums.net

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ABU

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Hi all,
I have more than 500meter potable water network line connecting to buildings, tanks say 25 branches which installed underground-main line starting from 125mm HDPE SDR11 to 40mm HDPE SDR11. What size of ARV to be used at ground level inside 600X600 ManHole.
 

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