New to me; I've never heard of the black tank flushing system being inside the "house" part of the trailer. Our Grand Junction's system only had a hose connection outside with the PEX tubing running directly to the black tank, the backflow preventer was just prior to the black tank, under the floor. There is no water pressure regulator in the flushing system, it would defeat the purpose, because it is never closed, the spray-head is always open. At home my outside hydrants are unregulated,and line pressure is 100psi. It rinses the black tank very well, and the sound of the swirling spray is obvious.
As to low CG water pressure, I have experienced the same lack of spraying sound often.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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