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I have some 4-6 inch copper piping that I need to replace a portion of.

I have looked and can go copper to pex no problem. But is is it possible to go from 4-6 inch copper to PEX? There is a significant size difference between the two, so I wasn't sure if this was acceptable or not.

Let me also add that the 5 inch copper gets reduced to a 1/2 copper, and has a tee connector, that continues to run to my water heater. Now I had to cap the tee last night as it was leaking, but when I remove the cap there will not be enough copper pipe to work with, so I'll have to replace a whole section.

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  • Go shopping. Shopping is off topic here. I'll bet a stale doughnut sharkbites are not made in that size, so that's not going to happen, but I'm not going shopping for you to confirm that. Either you find the fittings you need, or you find the fittings you need are not made in the type of fitting you want and you'll have to do real plumbing or hire a real plumber to do that for you.
    – Ecnerwal
    Dec 7, 2023 at 14:20
  • @Ecnerwal - by real plumbing you mean work with copper? Dec 7, 2023 at 14:21
  • I know copper sweat (solder or braze) fittings in those sizes exist, because I've used them. You're on the supply side, so rubber couplings are not an option. Copper press fittings may be available, but $$$$ for the tooling. PEX OD is Copper tube size, so if you have managed to find PEX that large (3" is as big as I've ever found) the diameter would be the same. Otherwise you'll need reducers that attach to 5" copper, and "appeals to homeowners that don't do soldering" fittings are unlikely to be available in that size range.
    – Ecnerwal
    Dec 7, 2023 at 14:41
  • I wouldn't trust a push connector for pipe that huge anyway.
    – isherwood
    Dec 7, 2023 at 14:41
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    I'm having trouble understanding this scenario. Why on earth would a supply be that large? And is it 4, 5, or 6 inch? Why the ambiguity?
    – isherwood
    Dec 7, 2023 at 14:44

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