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West Central Wisconsin | Installing our new water heaters today. They come with these one inch pipe nipples with these inserts. They do t act like check valves because there is just rubber in the middle of them. They look like they will really restrict my capacity. Are they needed? No mention of them in the installation book.
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IMG_20200603_115519266 (full).jpg (149KB - 69 downloads)
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Water heater install question
