The Cycle Gard Model C153SS, with corrosion resistance, stainless-steel valve body with NPT connections and heavy construction, is designed to reduce rapid pump cycling and maintain a preset system operating pressure of 40 psi, 60 psi or 70 psi independent from low or high conditions. This results in a longer system service life. The non-closing and self-cleaning valve seat design supports heavy hanging loads up to 3,400 lbs. and fits in a 4-inch well casing. www.flomatic.com