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Shop fire hydrant backflow preventer
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Zurn Wilkins 2-975XL2 2" 975XL2 Reduced Pressure Principle Backflow Preventer
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Honeywell BP900, BACKFLOW PREVENTER. 1/2" NPT. 175 PSI MAX. 250F TEMP. MAX. WITH INTERMEDIATE ATMOSPHERIC VENT. HEATING SYSTEMS
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doityourself.com
How to Install a Backflow Preventer | DoItYourself.com
If you have some experience in plumbing, you might add a backflow preventer to your pipes.
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