VR10, 1″ Adjustable Vacuum Relief Valve 0-27″ Hg Max. 5Hp $52.02 Add to cart VR25, 1/4″ Adjustable Vacuum Relief Valve 0-27″ Hg Max. 1/4 Hp $5.03 Add to cart VR38, 3/8″ Adjustable Vacuum Relief Valve 0-27″ Hg Max. 1Hp $7.59 Add to cart VR75, 3/4″ Adjustable Vacuum Relief Valve 0-27″ Hg Max. 3Hp $12.87 Add to cart