Plumbing · P-5QGFB

Plumbing Fixture Water Hammer Arrester Installation Diagram

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Water hammer arresters are installed on plumbing fixture branch lines serving water closets, urinals, and lavatories according to Plumbing and Drainage Institute sizing standards. Typical shutoff valves are located on supply lines branching off the main riser. Water hammer arresters are positioned near the terminal ends of fixture supply groups containing flush valves and automatic fill equipment. Sizing is determined by fixture unit ratings ranging from 1 to 330 corresponding to P.D.I. arrestor symbols A through F.

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