- New
385311658 is an OEM replacement flush ball seal for compatible Dometic and SeaLand gravity-flush RV toilets. Made of rubber, this seal sits around the flush ball mechanism to help maintain a watertight closure and prevent water from leaking out of the toilet bowl. It is compatible with select 300, 301, 310 and 320 series toilets. Check your toilet model and existing seal before ordering to ensure proper fit.