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aminus21 07-26-2010 01:29 PM

Copper Re Pipe
Hello all,

I'm going to attempt it..our new house is a small 900 sq foot place with old galvanized steel pipes. I'm going to replace everything until the shutoff right outside the house (not the one at the street). I plan on using a dielectric union between the two.

One question, I was under the house yesterday, and I noticed that in the kitchen the supply pipes go into the faucet, but they also T and go up towards to back of the sink ?!?!. I've never seen this before, I was thinking of just replacing to the sink and forgetting watever that T would go to. any idea on what it could go to? there's no dishwasher..

Thanks all.

rockerjockey 07-26-2010 04:10 PM

Could be air chambers.

majakdragon 07-26-2010 07:18 PM

I agree. Sounds like "economy" water hammer preventers. In Florida, we had to extend all water lines up at least 8" above the fixture take-offs. These pipes were capped to make an air chamber.

aminus21 07-27-2010 02:31 PM

So I suppose I don't need to do that?

majakdragon 07-27-2010 03:25 PM

They have a purpose, but are not required in most places.

aminus21 07-27-2010 03:37 PM


Also, for the shower, I don't want to retile right now, so would it be ok to throw on a 1/2 dielectric union and keep the steel pipes that go into the shower? I plan on doing the same at the main line right outside the house (with a 3/4" dielectric union)

also, can i cut the steel pipes with my 4 1/2" grinder and diamond blade? what else do people use to cut?

thanks all, you guys are making this go smooth..

aminus21 07-27-2010 03:50 PM

I guess I can use a sawzall to cut the old pipes too?

I ran up on this, but I think I'd only need something that smooth for new pipes.

LateralConcepts 07-27-2010 07:15 PM

Make your life easy and use PEX. With all the money you'll save on copper pipe, fittings, and dielectric unions, you'll be able to purchase PEX tools, i.e. crimper and cutters, and have some cool new tools to add to your arsenal. :thumbsup:

aminus21 07-28-2010 01:10 AM

I'm not planning on using PEX. Here, PEX has a really bad name, most plumbing stores don't even carry it. Rumor has it that rats can eat into it. I know code may allow it in some places, but here in SoCal, not many people use it.

I cut the wall on the other side of the bathroom sink, and low and behold, you guys were right! The supply pipes for the bathroom sink T-up about 10 inches, and are capped off. I took a pic.

Do I need to do this with the copper? My old house (although it had newer copper plumbing) was not like this. Thanks again guys =)

rockerjockey 07-28-2010 08:42 AM

It might be a good idea to have at least one set of air chambers somewhere on the system, but not necessarily at the sink. We usually put them above the water heater stub outs on new work. Some pressure balanced tub valves require them in order to work properly, Moen being one. I would leave them off for now. You can always add a hammer arrestor at the fixture supply later if needed.

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