This particular sprayer had a pressure relief valve that I replaced with a $10.00 pressure gauge and some plumbing I had on hand to let the pressure off quickly. You don't really need the gauge but it's handy to check quick if you still have pressure or need to give it few more pumps. This POS held 15 psi for extended periods long enough to do about 4 wheel cylinders and an H-Vac before I had to pump it again. The most IMPORTANT THING IS NOT TO LET THE FLUID LEVEL GET TOO LOW SO AIR GETS INTO THE SYSTEM.
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