The Primme toilet flushometer valve features a simple, brass-body design and reliable piston technology to meet the demands of high-use installations. Easy to install and suitable for retrofit, this water-saving manual flush valve is compatible with KOHLER tailpiece and stop valves. Engineered for optimal performance with KOHLER toilets. Fixture-mount design. 1.28-gpf toilet valve use at least 20 percent less water than standard 1.6-gpf toilet valve while still meeting strict performance guidelines. Self-cleaning brass piston prevents clogging and reduces maintenance. Intended for toilet installation with 1-1/2" top spud coupling connection. Durable brass construction.