FWIW: Prior MH, 2000 GeorgieBOy Landau, the plastic fittings for the PEX tubing began to fail at about 8-10 years. The plastic became brittle and would crack/leak if the tubing was moved. I replaced all the plastic fittings with brass and used the SS Clamps, not the compression rings. Clamps and tool available at Home Depot. I was able to access all the fittings.
Info on the plastic fittings stated that they become brittle when used with Chlorine. (RV water lines???