What is the Difference Between the Dometic 310 RV Toilet and Dometic 311 RV Toilet

Updated 02/09/2025 | Published 01/27/2022

Question:

What is the difference between a Dometic 310 and 311 Toilet?

asked by: John H

Expert Reply:

The main difference between the Dometic 310 Part-Timer RV Toilet # DOM57FR and the Dometic 311 Part-Timer RV Toilet # DOM67FR is that the 310 is standard height (20" tall) and the 311 is a low profile (15-1/2" tall). Both toilets will mount the same and have predominantly the same features. There are a few other small measurement difference but none as big as the height difference.

310 Measurements:
Overall dimensions: 18-1/2" long x 15" wide x 20" tall
Seat length: 15-1/4"
Seat thickness: 2-3/4"
Seat cutout dimensions: 10-3/4" long x 8" wide
Bowl depth: 8-1/4"
Total weight: 28.75 lbs

311 Measurements:
Overall dimensions: 19-1/4" long x 15" wide x 15-1/2" tall
Seat length: 15"
Seat thickness: 3"
Seat cutout dimensions: 10-3/4" long x 8" wide
Bowl depth: 8-1/4"
Total weight: 27.6 lbs

expert reply by: Scott S

Kim

2/9/2025

Is there an elongated model that will fit in the place of the 311

Robin H.

2/9/2025

@Kim all of the elongated models require 11" from the center of flange to wall. The 311 only requires 10". You can measure but, more than likely when they built the trailer they didn't leave an extra inch to use a different toilet. I know they didn't on my trailer which is frustrating. You can't do much about it without moving the plumbing or the wall behind it.