One of the plumbers at our shop had a call back on a recirc pump another plumber installed. This lead to a conversation as to how it should be done. No body seemed to agree on the correct method. I'm kind of ashamed to admit it but I never learned a correct method myself. It's kind of funny, our code spells out in great detail how to install an island vent but recirc loops are left to the plumber in the field to build without any code standard. I'm not talking about anything fancy, just a residential single loop set up. Any ideas? And what about the loop line, pex or copper? I read somewhere that pex should not be used in that application, but it seems better than copper.
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