I was using a regular hose bib regulator available at most accessory stores, but I was displeased with the rate of flow at the shower and kitchen sink. I observed the small openings on the inlet side of the device, and decided there must be a better regulator that would not restrict flow, but still protect the hose and plastic plumbing in my motorhome from high pressure.
I purchased a irrigation type 3/4 inch 20 gallons/minute 40psi regulator (at a garden center) and the needed male and female hose adapters (at home depot)for $20. Now I have at least double the rate of flow at both my shower and kitchen sink, limited only by the 5/8 inch hose and smaller RV plumbing.
I'll never change back to the "rv style" regulator!
2005 Gulf Stream Sun Voyager 8377 37', Workhorse W24, '05 Jeep Liberty towed, Full Time, Retired.