The Flushmate III M-101526-F31K 1.6 GPF Replacement System, is designed to replace the PF/2 Enigizer 150-403 and the WDI EcoFlush B8100, B8104, B8106 Series models for two piece toilet fixtures.The Flushmate III M-101526-F31K includes the Flushmate M-101526-F3 complete system with a replacement unviersal handle kit, locknuts and gasket to install in your Flushmate system into the toilet tank.The Flushmate III M-101526-F31K 1.6GPF Replacement system is designed to work with existing pressure assist toilets that were originally equiped with the PF/2 Enigizer 150-403 and the WDI EcoFlush B8100, B8104, B8106 1.6 GPF systems. (Price subject to change without notice. Check stock before order)