Not really necessary to protect the trailer for the reason you state. But some people will use one on the campground spigot (especially during hot weather) to protect their hose.
I have a 1978 31' AS rear bath. The internal city water pressure regulator is not working properly. Initially I have 45 pounds at bathroom faucet then it drops so low that my tankless water heater will not stay on due to lack of sufficient flow. I attempted to adjust the pressure regulator screwing the top stem up and down, but nothing changes. I am thinking about either replacing the regulator (any sources) or just taking it out and using a 40-50 pound inline regulator at the hose bib. Any suggestions?
I'd clean the hose screens first, regulators seldom go bad.
How do you know you have 45 psi at the faucet?
I replumbed my 75 Overlander with PEX recently to include all faucets, valves and the pressure regulator (which I found at Camping World, has a gauge and is adjustable, and made for a hose). I use a cheapo regulator to protect the hose.
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