I don't see one. And btw, I'm listing what I know, again (it helps me).
Water pressure (wp) was fine ... in kitchen, bathroom sink, toilet, shower, during our 18-day trip from Oregon to Tx in September. (stayed at several diff campgrounds, hooking up to water at each).
Motorhome spent several weeks at PPLmotorhomes in November (I'm suspicious of them). We asked them to check out a leak in the wet bay - they said they fixed it (when we discovered they didn't fix it, we made them take that charge off the bill).
Next trip - poor water pressure at kitchen sink and bathroom sink and toilet. Shower was ok - never a gushing waterfall. but normal for an RV - we can take showers and even wash our hair.
Pencil stream at sink and bathroom sink, and toilet is unenthusiastic (I keep a cup and a bucket in the shower just in case

), but adequate.
We had an RV handyman take a look - he says the fittings are all too small in the wet bay and he wants to rebuild that area. I'm thinking that maybe the PPL folks messed it up.
Anyhow, we're getting by, but I'm thinking too-small fittings - but how is shower doing so much better?
I'm a serious cook, and really hate the pencil stream in the kitchen.