Overview Reviews Product Description Replacement sponge rubber Closet Flange Seal for all Thetford Permanent toilets. Product Videos Custom Field Product Reviews (No reviews yet) Write a Review Write a Review × Thetford RUBBER TOILET GASKET Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments