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Author:
krazy (CA)
Hi guys,
First post here. I've been lurking a lot and researching... thanks for the helpful info!!
I'm trying to install some new kitchen appliances in my RV. Unfortunately, it means working with the PB that's already in there, and using compatible fittings.
The supply pipe size is also a bit weird. My supply is 1/2" (nominal), which seems a bit large for kitchen plumbing.
Anyways, I need an elbow and a tee... I've spec'd out Qest 1/2" elbow + 1/2"x1/2"x1/4" tee, however, it seems virtually impossible to find a 1/2" -> 1/4" reducing adapter. (I'm also unsure of what material it should be... can brass work with Qest?).
I'm also wondering if I have all the sizes right. Would somebody be so kind as to check my math, on this?
Here's my plumbing system:
Thanks for any help!
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Author:
North Carolina Plumber (NC)
Instead of that tee, I'd use a 1/2" tee, then an icemaker 1/4 turn valve. That'll get you back down to 1/4". I would also use a 1/2" Pex X 1/2" poly transition coupling as soon as possible. That'll sure help with the fittings you can use .
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Author:
krazy (CA)
Sorry, what's a '1/4 turn valve'?
Also, can brass/stainless fittings (nipples, nuts) be used on plastic parts (i.e. Qest)?
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Author:
krazy (CA)
Right, but could that metal fitting be used on a plastic Qest fitting? I've heard conflicting responses.
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Author:
packy (MA)
with the proper stainless steel insert sleeve you can use a compression stop on plastic pipe.
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Author:
krazy (CA)
What do you mean by 'insert sleeve'?
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Author:
packy (MA)
a thin piece of stainless steel tubing with an OD just smaller than the ID of plastic pipe.
slips inside the plastic to stiffen the pipe end so a metal fitting can be attached.
have a look here..
[www.google.com]
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Author:
krazy (CA)
That's a ferrule, right? I thought those we're not supposed to be used on plastic fittings, because they could cut the tubing?
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Author:
North Carolina Plumber (NC)
A ferrule goes on the outside of the pipe, an insert goes inside the pipe. Plastic pipe uses plastic ferrules, copper pipe uses brass ferrules.
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Author:
packy (MA)
i use brass ferules on pex pipe all the time.
done hundreds and hundreds of chrome fixture stops with NEVER a problem.
the stainless stiffner is the secret. watts compression fixture stops come with a stiffener inside the plastic bag and are clearly labeled for pex..
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Author:
hj (AZ)
A picture of what you have, instead of a drawing without a lot of information, would help us a lot more. Depending on your shut off valve, you might just need a "add on tee" to make the connection, but without seeing what you have it is just a guess.
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