Automatic tank fill and shut-off without the use of floats or sensors. Accurate shut-off to within inches of set point. High level point adjustable with single screw. Exhaust-to-atmosphere operation allows minimum pressure loss. Can be maintained without removal from the line. Adjustable response speed. Available sizes: screwed ends - 2 - 3", grooved ends - 2 - 6" and flanged ends - 2 - 24" (globe) and 2 - 16" (angle). Body bonnet is made of ductile iron per ASTM A536, Grade 65-45-12. Ferrous surface is coated with 4 mils of epoxy.