You will love it. It's the same setup I have and it just keeps pumping day by day. You may have problems with the gun leaking after a while then make a PVC wand with a ball valve much better setup and problem free.
You are right about that poly gun. It has ss ball and spring which becomes pitted. I explain that to each potential buyer. You may use a pressure washer gun with a ceramic ball instead.
You can go to Home Depot or the local hardware store to make your own ball valve wand assembly. We prefer all sch 80 components. However, sch 40 is easier to find.
All-Flo, Yamada, or Delavan 5850 systems:
Get a 1/2" sch 40 or 80 threaded ball valve
Threaded 1/2" nipple to desired length
45 deg threaded coupler
1/2" x 1/4" reducing bushing
1/4" mpt socket in stainless steel
1/4" fpt plug in stainless steel
Spraying Systems SS or PVDF nozzle
Pipe Dope for assembly
Delavan Fatboy
Use only a 3/4" threaded ball valve
NO NIPPLE
3/4" x 1/4" reducing bushing
1/4" mpt socket in stainless steel
1/4" fpt plug in stainless steel
Spraying Systems SS or PVDF nozzle
Pipe Dope for assembly