Crispin Valve manufactures Air Release, Check, Plug, and Butterfly and Metal Seated Gate valves for all needs. Our X Series air release valves eliminate inline backflushing. Our AWWA C504 K-Flo Butterfly Valves are available in sizes from 2" to 168". Check valve types include Swing, Rubber Flapper, Center Guided, and Tilting Disc. Sizes thru 72". Metal seated double disc gate valves available up thru 108".