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Chlorinated polyvinyl chloride (CPVC) is a thermoplastic produced by chlorination of polyvinyl chloride (PVC) resin which is significantly more flexible and can withstand higher temperatures than standard PVC.[citation needed] Uses include hot and cold water pipes, and industrial liquid handling

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I get being in earthquake country you have to have flexies on your h20 and gas, and tank strapped to wall. But why atmospheric vent over power vent. Both are both rigid right? Or does the atmospheric vent move or have some expansion joint or something?
 

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What is the cpvc? I've never seen it here.
Chlorinated polyvinyl chloride (CPVC) is a thermoplastic produced by chlorination of polyvinyl chloride (PVC) resin which is significantly more flexible and can withstand higher temperatures than standard PVC.[citation needed] Uses include hot and cold water pipes, and industrial liquid handling

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Flyout, you still pouring lead up there?

We are seeing more and more CPVC residentially down here. I was putting it in some 15 plus years ago, in adaptable 4 families. Only real issue was conversion, make sure a CPVC male into a copper or brass female. Had to wait maybe an hour on the average to re-pressurize it. Now that they have factory made conversion fittings, even easier.

Just harder to get it looking good. less noise and heat transfer. More expansion though.
 

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This one started a riot about tees on vents..
Yeah I remember this one. I never said it wouldn't work but it wouldn't be allowed here not only because of the tee's but because it is flat vented. Here we can't turn a vent horizontal until it is 6" above the flood rim level of the fixture or group of fixtures it is serving. Still great looking work.
 
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