Restop Ring #90270500 3;. Adopt advanced seal structure to reduce loss in pressure and water leaking between the head or manifold of the pump and the back end, rebuild and strengthen your pump. ✅For General Pump: T1011, T1311, T1511, T2011, T2031, T9121, T9131, T9161, T9211, TS821, TS1011, TS1021, TS1311, TS1331, TS1351, TS1511, TS1521, TS1711, TS2011, TS2021 ,TS4040.