Brass vacuum relief valve 0-30" Hg Vacuum Range 1/4" Male NPT

Vacuum relief valve with brass body, adjustable relief pressure, and a 1/4" male NPT threaded inlet connection. This proportional-type relief valve opens at a rate relative to the increase in vacuum pressure, and can be adjusted to open between 0 and 30" Hg (inches of mercury) using the knurled adjustment screw and locking jam nut.