Manual shut-off pressure relief valves are three-way, two-position valves (with 3 threaded ports) used to maintain upstream pressure and relieve downstream pressure. The manually-rotated knob can be locked out with the included padlock. NITRA relief valves can be used with shop/plant air supply or at individual machines.
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Would you buy this item again? Yes
I would recommend this for most users, I just wish the lockout would support a larger diameter shackle for a normal lockout standard. I have typically seen in use, Master Lock - Keyed Different Nonconductive Lockout Padlock - 1-1/2" Shackle Clearance, 1/4" Shackle Diam, 1-3/4" Body Height x 1-1/2" The lock that comes with the unit is...pretty (with the flower).. but not quite a standard that I have encountered2 of 2 people found this review helpful.