The stainless steel piston pump even gives you the ability to work with unthinned paints because it allows you to spray at high pressures. (geekwrapped.com)
Stainless steel pistons with high temperature bore seals minimize heat transfer and provide maximum durability in the most extreme circumstances. (sema.org)
If you want to spray some paint that hasn't been thinned, you will easily be able to do so with this product because it features a ProX Stainless Steel Piston Pump, which is capable of spraying at high pressures. (geekwrapped.com)