Works on the principle of utilizing fluid energy for shut-off, rather than limited energy of floatation. The adjustable anti-siphon FLC valve provides less shut-off noise, shorter fill-up time, positive shut-off, elimination of water waste and drip. Entire fill valve is constructed of noncorrosive plastic and metal materials. The FLC valve is adjustable from 9-1/2" to 14" high and fits most any toilet tank. Meets code approvals for: CSA (Canadian Standards Association), UPC (Uniform Plumbing Code), and ASSE (American Society of Safety Engineers).