most of the time, it the water lines vibrating against wood, that makes so much noise.
you can buy a Shurflo silencing kit or look to see what is making the noise.
mine was the lines vibrating against the wood cabinet they were in.
moving them away and wrapping them in some rags, eliminated almost all the noise.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC