I've seen some watermaker pump questions here in the past - where's
the DIY watermaker expert - here's another.

I can get a good price on a new CAT 280 pump - 3 gpm at 1000 psi.

Cylinder and sleeve wear surfaces are hard chrome plated 304 stainless
steel - 304 Stainless steel discharge valves for wear resistance.

Prev thoughts were that either 316 SS or Bronze were or for
watermakers - how about the 280?