Water hose diameter

There is one time where diameter matters, and that is if using a macerator pump. There, an oversized hose will be very useful.

I do not think it will make much difference, As the PEX in the RV is smaller. HOWEVER.. that said. The smaller the hose the more resistance to the flow of water... And that extra 1/8 inch will very likely make at least a small difference.

The biggest flow restriction in man RV's is the pressure regulator, they come in assorted types

Brass or plastic cylinder solid Very restrictive
Same with bright colored grip on female end (Camco has wings) still restricrive

Sur-flow (Often built into the city water inlet mine is an "in-line) slightly restrictive.

I just got a new ZURIN 70XL 3/4 inch with hose fittings.. I set it for 50 PSI, then turned on the outside shower and the pressure remained at 50 PSI

(With the sur-flo it dropped to about 10 Nt old Watts to 20, ,, NOTE the word "OLD" preceeding Watts. I think it is in need of a rebuild kit. but alas. I'm a couple parts short. If I ever fix or find the missing part I will get a rebuild kit and try it again.. it is old and much abused)

skipnchar wrote:
Water volume will be determined by the smallest diameter in the system between water source and the faucet.

Plumbers know three things :
Stuff flows downhill .
Payday is Friday .
A Steamfitter is a Plumber with a GED .

To many folks here with PHD's in physics here. Simple solution .... just hook up the other hose and see if it works. I don't have a PHD in physics, just a bit of common sense. Actually, I'm not physical at all! I'm a vegetable, since I vegetate when I camp! Yup, no PHD for me!

Thanks all for the replies. I guess to simplify the original question down- Does anybody use a half inch? I agree that there should be no difference, just wanted to verify before I invest in the hardware. Thanks again.

I would not use 1 /2" .
5 /8" is most common and cheapest .
In plumbing and electricity the smallest pipe diameter restricts the flow of the entire run .
As has been pointed out .
In actual practice there is a slight advantage to using 3 /4 if the runs are long .
That should not be true .
But it seems to work that way .
I have a 3 /4 ( expensive ) and a 5 /8 .

I would worry more about flexibility. I have 3 Camco hose that are soon to hit the trash. A real pain to roll up when it's cold and even warm they are a PITA.