Best plumbing materials for a leaky 2012 bighorn

Using a good water pressure regulator is a must. When you connect to the campground water it may not seem like it has a lot of pressure, but when everyone that uses that community water system goes to bed it can double. I use a whole house residential one purchased from Lowes. You can also get the fittings there to adapt it to hose fittings. Another advantage of using the residential regulator is that the flow is not restricted, only the pressure. The $8.00 ones made for RVs are worthless.