From the Manufacturer - Toto thu460. 6d-atoto drain valve assembly for 1pc l6 634 644 863e 864e sp. Perfect fit, and works much better then the flapper type valve. The flapper valve has two mounting screws, so the seal tends to leak. Product information - Part Number: THU460.6D-A - Item Weight: 8.2 ounces - Product Dimensions: N/A
