I'm doing some faucet mods on our 2018 ST310GK and have questions about the supply lines to the faucets. What is the name of the hose they use to supply the bathroom faucet? Kinda looks like PEX but it's flexible so therefore not PEX. I need to splice two pieces together. Can you splice and crimp this type of hose with the crimp rings the same way as PEX? Or, what's the best way to join 2 pieces in a splice?