Alternative Toilet to the Dometic 300

Updated 12/16/2025 | Published 07/31/2025

Products Featured in This Question

Thetford Aqua-Magic Style II Part-Timer RV Toilet - Standard Height - Round Bowl - White Ceramic

(138)

$221.32

Dometic 300 RV Toilet - Standard Height - Round Bowl - White Polypropylene

(128)

$206.72

Question:

I’m looking for a toilet alternative to the dometic 300. Preferably with a ceramic bowl. My rough in dimension is 9”

asked by: Chris

Expert Reply:

Thanks for your question, Chris!

After looking at a Dometic 300 (part # DOM64FR) the closest that we have in to a 9" that is ceramic would be part # TH49FR - Thetford Aqua-Magic Style II Part-Timer RV Toilet - Standard Height - Round Bowl - White Ceramic. I did notice that your current toilet need an 8-1/2" spacing from the center of the center of the floor flange to the wall however, the one from Thetford needs 9-1/2" minimum so there might not be enough clearance.

If you can check the measurement between the wall and the center the the flange, I can double check other options we have and let you know what's available.

expert reply by: Gwendolyn Y

Shawn P.

12/12/2025

I currently have a automatic 300 FR and need a replacement toilet, preferably with a elongated bowl and ceramic instead of plastic more durable than the automatic do you have any options please email me back with options that will work. I have a I have a micro boost XLR fifth wheel

Gwendolyn Y.

12/16/2025

@ShawnP We have the same Dometic 300 toilet you currently have, and its measurement from the wall to the center of the floor flange is 8-1/2". The only replacement option that fits this clearance is the Seaflo ceramic toilet with an elongated bowl, part # SE92MR. All other toilets require more space between the flange center and the wall, so the Seaflo model will be the perfect replacement for your setup.