Model castle how to designs for school projects20 inch Extra Tall Toilet. Convenient Height bowl taller than ADA Comfort Height. Dual flush, Metal handle, Slow-close seat - - Amazon.comExit code 0x80070643Common silicone sealer, stuff like Hylomar as well as cutting one out of a sheet of gasket paper will all work. I usually go for the Hylomar like stuff (which in itself is a kind of silicone sealer, though a natural one), it's the less fuss. Combining the old gasket, if it's still in shape, with Hylomar even works better. Ciao, Kai