If your TOTO toilet is running constantly or the tank isn't holding water, the flush valve seal might be the issue, and this 5-pack of THU128 compatible silicone gaskets is exactly what you need.

These are designed specifically for TOTO's 3-inch flush valves, with an outside diameter of 3.54 inches (9 cm) and inside diameter of 1.38 inches (3.5 cm), so they fit snug and seal properly.

Made from high-quality silicone, they're more durable than old-school rubber and won't harden or crack as quickly, so you're not replacing them again next year.

You get five gaskets in one pack, which is great if you have multiple toilets, or if you just want spares on hand for the future.

Installation is a breeze – just remove the old one and pop this one in.

No tools, no drama.

Just make sure you measure your dimensions first to confirm compatibility.