Description Replacement Vacuum regulator for small portable milkers up to 3/4 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 Made in USA Related items; 7121 valve with 3/4 NPT 7126 Glycerin filled vacuum gauge for portable pumps in stock updated August 2026
