Replacement valve sealing washer to suit all Geberit close-coupled, Ceramic and built-in concealed flush valves. The new silicone design should ensure the seal being longer lasting to the previous grey version which was liable to shrink and blister. To make sure none of them leak out we've got a this replacement seal that will fit all your close-coupled, ceramic and built-in concealed flush valves made by Geberit. This replacement is better than the old grey version because it won't shrink or blister even after years of use! Trust us, this thing's so reliable you'll want to install two!.