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The Watts N45B is a water pressure reducing valve designed to regulate incoming water pressure and protect plumbing systems from excessive supply pressure. Manufactured by Watts Water Technologies, this valve was commonly used in residential and commercial plumbing installations to maintain stable downstream pressure and help protect pipework, fixtures, and appliances from damage caused by high water pressure. The N45B model has since been discontinued and replaced by the updated lead-free LFN45B pressure reducing valve.
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