1. find smarter employee. Ask if there's a plumbing specialist in-storeYea. The guy had no idea what i was talking about. i had to explain what cpvc was and he still didnt know what i was talking about. Then i looked up and down the plumbing and electrical aisles and couldn't find it.
2. CPVC is used mostly in potable (drinking) water as a substitute to copper tubing- as such it's near the copper tubing (In my experience anyway).
While Im here, what springs are you using? I'd recommend [k26] (Plusbow spring) which you can order off McMaster or buy from Split's sales thread.