Plumbing – Can small supply pipes be combined into a larger supply

plumbingshower

we are installing a shower where two sinks used to be. Is it possible to combine the inbound water (1/2") from each sink into one 3/4" line for hot & cold to feed the Moen U valve we want to use to distribute water throughout the shower?

We will have the following in the shower:

  • 2 or 4 body jets
  • 1 10" jaclo showerhead
  • 1 12" jaclo rainshower
  • 1 handheld wand

Thanks for your help.

Best Answer

I'm not a plumbing code guru, but I see no problem with what you have planned. The only side effects I can think of are a slight increase in noise (due to the added turbulence) and the possibility of stagnant water in one side, should there be an odd flow imbalance.

Be aware that the two 1/2" lines may not be supplied by a 3/4" line, though. They may just split from a single 1/2" line, whereby your plan would be pointless. A split 1/2" line is probably more common for bathroom sinks, which don't require a lot of flow.

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