Wondering why your toilet is leaking? It could be the seating washer. A seating washer is a circular rubber component that seals the base of your outlet valve, rising to release water when the flush button is pressed. If this component becomes old and worn it could cause the toilet to continually leak into the bowl wasting precious water and money. Replacing a seating washer is an easy way to fix a leaking toilet. (Consult your local plumbing regulations. FIX-A-LOO recommends using a licensed plumber for all plumbing work). Washer Dimensions: Outside Diameter: 66mm, Inside diameter: 25mm, Washer thickness: 1.60mm | FIX-A-LOO Seating Washer - Suits Caroma Duoflo And Thunderflush