The Watco Innovator overflow bathtub plate kit easily retrofits a 1-hole, 2-hole and Trip Lever overflow plates. The Innovator kit includes the Innovator overflow plate, black retainer nut and an H bar adapter. FYI - bolt not included to secure retainer nut behind the H bar adapter. Use your existing H bar adapter if you have a 1-hole, 2-hole or Trip lever overflow plate.