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Zurn 3/4 in. Bronze Double Check Valve Backflow Preventer-34-950XL
15mm dcv valves
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22mm double check valve
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What is check valve? how many check valves ?
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![Installing a backflow prevention device](https://i2.wp.com/pw-cdn.watercorporation.com.au/-/media/WaterCorp/Image-Gallery/Page-Images/Developing-and-Building/TEMP-Developers-and-builders/double-check-valve.png?rev=8337863117004a8593983c5c39cf2b69&hash=8E6D2AC0A884E8FC806AD8F4A17FE9A6)
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