Replacement Vacuum regulator for small portable milkers up to 1 HP
3/8 NPT for easy mount.
Made of brass, stainless steel and nylon
Once you set the regulator, tighten the threaded brass ring to hold a stable vacuum level
replaces relief valve 3400018 VR38
7121 valve with 3/4 NPT
7126 Glycerin filled vacuum gauge for portable pumps