[rohrmann]

The cheap fixed 'regulators' are nothing more than a restrictor with no moving parts and water flow is usually marginal at best. I originally had one that was rated at 45 psi, and due to low water flow I purchased a Valterra one that was rated at 50-55 psi. This had a little better flow but did not hold the static pressure at the range printed on it. The following photos show this regulator, and the square part with the rubber insert is driven into the bore with the rubber side against the hole inside, so I suppose the water pressure has to squeeze past the rubber face of the square part that is against the hole to make it's way into the trailer. I have found the better adjustable regulators hold the pressure as they are set at and provide much better flow.