Naval Squat Toilet Flushometers Quiet, Adjustable Piston Type, Closet Flushometer for top or back inlet squat toilets with the following features:Self-cleaning Xpelor ® Bypass 1" I.P.S. Screwdriver Bak-Chek Angle Stop Vandal Resistant Stop Cap Adjustable Tailpiece Vacuum Breaker Flush Connection Ultra High Copper, Low Zinc Brass Castings for Dezincification and Salt Water Resistance Handle Packing, Stop Seat and Vacuum Breaker molded from PERMEX Rubber Compound for Chloramine ResistanceValve Body, Cover, Tailpiece