My 2012 Navion 24M came w porcelain, after a winter valve freeze I replaced with plastic. Used plastic about a year then switched back to porcelain because it was easier to clean and quieter although much heavier, Found that the parts and mounting are interchangeable, Could just buy the porcelain bowl and mounting gaskets and switch the other parts,
The toilet in the 24M is against the rear exterior wall - beside normal freeze protection, a piece of 1 1/2" foam insulation can inserted between the toilet bowl and exterior wall to protect the spool valve and upper bowl plumbing from freeze.
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