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Posted by Jimmie D on April 8, 2008, 11:10 am
>>
>>
>>
>> >> > What the best way to connect Cu plumbing to a PVC supply line.
>> >> > Pipe is 3/4 inch.
>>
>> >> > Ive fixed this a couple of time and had it professionally done but
>> >> > the
>> >> > screw together joint made of a threaded male PVC adapter and CU male
>> >> > threaded adapter eventually leaks. I am thinking I have an expansion
>> >> > issue
>> >> > here and I am going to try to make an expansion jiont using a loop
>> >> > of
>> >> > flexible copper to connect the two.
>>
>> >> > Any other opinions are welcome and appreciated.
>>
>> >> I have a few feet of Teflon chemical transfer hose (unused). Im going
>> >> to
>> >> put
>> >> barbs on the PVC and Cu and connect them together with the hose. I
>> >> know
>> >> this
>> >> will make a good connection and if there is a problem with expansion
>> >> and
>> >> contraction it will take care of that too.
>>
>> > Elaborate on what you mean by barbs, then on how you are going to put
>> > barbs on the PVC and copper.
>> > Out of curiousity, did you look into the Sharkbite fitting?
>>
>> Barbs the Ribbed piece you slide a hose over and clamp it.
>> They have them in HD for Cu and PVC.
>
> I just wanted to clarify what you meant and make sure you weren't
> doing something wacky.
>
>> Sharkbite doesnt work with regular old PVC. At least thats my
>> understanding.
>
> Actually, they do work with PVC. Why their specs list only CPVC, I
> don't know, but as long as the PVC conforms to CTS there's not a
> problem. If you're a by-the-book guy, you could use all purpose
> primer and cement to glue on a coupling and piece of CPVC to
> transition so you could use a Sharkbite. I'm not saying you should,
> but you could.
>
>> I really like the chemical transfer hose. Its a little pricey at over
>> $5.00
>> a ft the last I bought but its great for repairs and last forever. I
>> still
>> have a few ft left so it's spent money
>
> Well, the stuff you have on hand is 'free', but you still have to buy
> and install the barbed fittings you mentioned and you'll have four
> potential leakage points instead of two.
>
> It's weird how this one joint has been such a problem over the years.
> Even if there's a fair amount of expansion going on, repairing one
> joint five times is highly unusual.
>
> R
Yes very weird. I think its because the actual cause of the problem has
never been addressed. I have no direct proof that this is an
expansion/contraction problem but its the only thing I can think of that is
left.
The PVC comes up through a concrete slab from the well, then transistions to
Cu then on to 2 (hot and cold) whole house filters.
I think its because there is just no wiggle room in the pipe and its pulling
loose at the weakest point.
Also to use the Sharkbite I would have to cut off a few inches of PVC and Cu
and then add pipe back on to at least one of them to be able to clean things
up enough to use the sharkbite. With the hose all I need to do is cut back
far enough to get a place I can glue/solder on the barbs
I dont know how you figure I will have 4 leakage points. Ive never had a PVC
glued joint or sweated Cu joint that I made leak on me in my life. I wish I
could say the same for the combination of the two.
One thing I have learned about threading metal in to PVC is to run a tap
into the PVC and use pipe dope instead of PTFE tape.
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