I have Delco Cobalt 5gpm 3500.
I put a gauge on the gun to see if the nozzles worn out. When i squeeze the trigger gauge shows 3200 psi, when i release pressure jumps to 4000psi and then goes to 4500 psi within 10 seconds. Why is that? I dont like having 4500 psi inside 4000 psi hose. And if you put DS nozzle on and squeeze the trigger the recoil almost dislocates your shoulder!