Essentially there are three "Dometic toilets" used in Keystone trailers.
The first is the 300 series, Extremely light weight, round PLASTIC bowl.
Next is the 310 series, Heavier, shaped like t he 300, but has a ceramic bowl.
Next is the 320 series, Larger than the 300/310, so it may not fit in the same space, elongated bowl, has a "rim to prevent sloshing" and the bowl is ceramic.
Plastic bowls scratch, those scratches lead to cleaning issues/staining issues.
Ceramic bowls are more durable, easier to clean, but weigh significantly more, so in an ultralite or superlite trailer where every pound counts, manufacturers either install the 300 series or go to the "lighter weight Thetford toilets...
Some love Thetford, some, not so much. That's a different thread...
The only "elongated toilet" in the "Dometic 300 series" is the 320. It won't fit in every bathroom, so measure carefully before buying.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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