Max water pressure for flushing 175 outboard?

[Rod Cunliffe]

What is the maximum water pressure you can flush a Yamaha 175? I have low house water pressure which is insufficient so was going to use a water pressure unit.

[boats.net]

Not sure never tried to max it out, since it was designed to use home water systems probably about 50 psi.

[99yam40]

not sure what kind of water pressure unit you are speaking about, but I am thinking you need to be able to furnish enough water flow also,

[Twin 150's]

On average metro houses water pressure is about 500-600 kPa or 70 to 80 Psi but i agree with 99yam40 i dont think it is about pressure but about enough water to travel through the water pump

[rodbolt17]

if your using the flush muffs or the onboard flush, 100-150 psi is good.
wide open baby.
some of the older junk,mercs,yammis and some others that used a screw in flushure you had to watch water pressure of a drive shaft seal may leak.

[Rod Cunliffe]

Flushing water pressure

Advice much appreciated. All seems ok now with house pressure in correct orifice!