Re: replce galvanized with cpvc
Posted by hj on November 05, 2002 at 07:22:39:
In response to Re: replce galvanized with cpvc
You have discovered one of the disadvantages of CPVC. Since it has the o.d. of copper tubing but the walls are thicker the effective pipe size is about one size smaller. I always suggest using the next larger size when piping with CPVC to ensure proper volume.

: I am relocating a lavatory and shower in my bathroom. The house was built in 1968 and has 1/2 inch galvanized running to the fixtures from the 3/4 inch galvanized main. In looking at the cpvc pipes, I noticed that the interior size of the 3/4 inch pipe is closer in size to the 1/2 inch galvanized than the 1/2 inch cpvc. Should I use the 3/4 inch cpvc to the fixtures or the seemingly smaller 1/2 inch? This is the first time I have used this product and I dont want to lose pressure by using too small of a pipe. Your comments would be greatly appreciated.

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