no built in regulator from factory
to troubleshoot
put a gauge on the rv and see what psi you are getting
if its lower then anticipated test the incoming psi
if delta get a better regulator, the restrictors are not awesome, especially if they are getting low psi supply
or
run off the pump even at rv parks, I've had better luck on the pump vs on the rv supply
but,,, your rv isn't going to be like your house
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