Crispin Valve is proud to announce that its KFlo butterfly valve line has recently been certified by Underwriters Laboratories, Inc., for water quality. UL has approved both the 500 Series (sizes 4 to 20 in.) and 47 Series (sizes 24 to 168 in.) butterfly valves for use with drinking water system products and materials. Both valve lines were tested to a 23°C water-use temperature.