The HARDI 101074 membrane is a genuine OEM replacement part designed for a wide range of Hardi sprayer pumps. This essential component ensures optimal sealing and efficient operation of the pump, maintaining sprayer performance and preventing leaks. It is compatible with numerous Hardi pump models, including 363, 463, 563, 600, 603, 700, 703, 800, 803, 1000, 1003, 1200, 1203, 1303, 1500, 1503, 1600, 1603, 1800, 1803, 2000, 2003, 2200, 2203, 2500, 2503, 3000, 3003, 3500, 3503, 4000, 4003, 4500, 4503, 5000, and 5003 series.