Unfortunately the design of the Dometic 300 Toilet # DOM74FR means you can only use their Seat/Lid # DMC99FR. You may be able to upgrade to the Dometic 310 Toilet # DOM37FR which has a much nicer slow close lid made of a better polypropylene material. To verify if you will be able to use the 310 you need to ensure you have at least a 10" rough in which means you need to have 10" from the wall to the center of the drain/mounting bolt hole location. view full answer...
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