Dometic 385311658 Flush Ball Toilet Seal Aftermarket by Kit King USA.
Compatible with Dometic 300, Dometic 310, and Dometic 320 pedal step flush toilets
Dimensions: 4 Inch Outer Diameter. 2.75 Inch Inner Diameter. ~.26 Inch Thickness/Height.
Premium material designed to last. Put our seal to the flush test.
Easy installation without taking the whole toilet apart. See below for quick instructions.