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    HDD, Duckbill Valve and Air Valve

    I have 3 questions and wonder if someone here can help: 1. I need to lay a sewage rising main in a winding footpath. Can HDD adopt a meandering alignment from one single drill pit? 2. What is typically the head loss coefficient of a Rubber Flex Slip-In In-Line Duckbill Check Valve and a Low...

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