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That is PEX, not CPVC. HJ is wrong on sizing, Copper and CPVC are close in size (copper is a little bigger). PEX is smaller than both and the fittings 50% smaller. With that plastic crimp fitting, and that many of them, its probably going to kill your water pressure. 3/4 pex with those...

Wiring that is coated in a vinyl plastic uses plasticizer to make it soft and flexible, that plasticizer can migrate from the wiring into other vinyl materials and make it soft. On a pressure piping system, that softness comes with a reduce pressure rating and could cause a failure. If its nylon...

There's an expansion loop calculator here: https://online.lubrizol.com/TempRitePipeSizing/Expansion You should be able to use an offset instead of a full loop to handle the expansion, that would only require 2-4 couplings & 2 elbows. Part of the issue in the original install might be that the...

I prefer to work with CPVC, especially in a repipe I've heard a lot of complaints about the difficulty of crimping/expanding in tight spaces. At the builder show last year in Orlando I saw some scary stuff about pex that reminded me about polybutylene too, granted it was from the cpvc guys, but...

The sch. 80 is iron pipe size won't work with the copper tube size (cts) pipe without special adaptors. Using a 1x1/2 tee with a 1/2" x 1/4" bushing as suggested above is probably the best option.

Compression fittings are approved for CPVC, but keep 2 things in mind: 1. Be careful not to over-torque the connection 2. When cutting into the pipe, use a wheel cutter or fine tooth saw, ratchet cutters aren't intended for use with aged plastic pipe and can damage it

As far as sizing goes, CPVC is copper tube sized, and I believe actually has a slightly larger ID than copper. PEX has a smaller ID and the fittings constrict water flow even more. If you want to stick with 1/2" and water flow is your main concern, I'd recommend CPVC. As noted above, the...

I would highly recommend CPVC for three reasons: 1. Without the ability to properly anchor PEX, it will flop around in the wall causing noise issues and risking hitting a nail; because CPVC is rigid, it wont move around as much 2. PEX is generally not allowed in plenum spaces because it is...