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Do isolating valves prevent water backflow.
Discuss Isolating Valves in the Plumbing Jobs | The Job-board area at PlumbersForums.net
Buy the current water regs book. If you are in the arena where regs compliance is part of your daily grind, then it is invaluable. From a business perspective, a job quote is often made higher by the requirement to install specific valves/bits/methods in order to comply. Many cowboys ignore this, so the 'proper' plumber is at a disadvantage. If you show the customer the relevent paragraphs in the regs book, I have found this often (sadly not always) overcomes the price objection.In what circumstances would you need either a single or double check valve to prevent backflow?
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