On my Scenic Cruiser you remove the outside plastic cover behind the outside shower and outside faucets and both tanks are then exposed. Lot of PEX lines can be seen from that inspection area. I believe RV's now days all use PEX water lines and are in different colors to distinguish which are for hot and which are for cold water.
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2002 Gulf Stream Scenic Cruiser
2018 Buick Envision Essence
Neway Freightliner chassis
Aventa II Blue Ox
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