Replacing SeaLand 510 RV Toilet With Dometic 2 Bolt Flange Toilet Using 4 Bolt To 2 Bolt Adapter
Updated 08/15/2025 | Published 07/21/2025
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Question:
hello, I want to replace my SeaLand 510 toilet. is there an adapter from a 4 bolt for a 2 bolt base? I clicked on a link that said the Dometic 300 could replace it how ever the bolt pattern is 2 vs 4
asked by: Donna
Expert Reply:
Good eye Donna! Some people just install the 2 bolt Dometic 300 Weekender RV Toilet # DOM64FR onto a 4 bolt setup, but only secure it by the 2 bolts, which is not technically correct as this could cause issues and not fit correctly.
The correct way to do it is with the Dometic RV Toilet 4 Bolt Flange to 2 Bolt Toilet Adatper # DOM73FR. I've attached a photo of the instructions to help you out.
What happened to the old toilet? Just ready to be updated?
(click to enlarge)
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Andrew N.
8/15/2025
Hey Donna, did the adapter work out for replacing your SeaLand 510 toilet with the Dometic 300? I'm curious because it might help others facing the same challenge!