Best Toilet Replacement for a Thetford Model 31684

Question

Question:

I need a replacement for a Thetford model: 31684. I prefer a full size toilet if the bolt pattern is the same. What do you recomend? This is for full time RV living.

asked by: Victor

0

Expert Reply:

Hey Victor, thanks for reaching out!

Your Thetford 31684 has a rough-in measurement of 7-5/8" so the Thetford Aqua-Magic VI RV Toilet # TH37SE is the best replacement for you because it has the same profile so no modifications are needed to get this to fit your current setup.

expert reply by: Jon G

0

Samuel C.

1/12/2026

Hey Victor, how did the fit work out with the Thetford Aqua-Magic VI toilet in your RV? It sounds like the matching rough-in made for an easy swap. Your feedback could help others looking to upgrade for full-time living.

Answer 1

The Thetford Aqua Magic V RV Toilet 31684 has a rough-in of 7-5/8". This is unfortunately not a lot of space so most of your newer toilets will not fit. The rough-in is simply the distance from the center of the floor opening to the wall. The…

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Answer 2

Hello Martin, Great question. The Aqua-Magic VI #TH37SE uses the same standard 2-bolt pattern and seal style as the Aqua Magic IV. So from a bolting-it-down standpoint, they’re compatible. The only thing you really need to double-check is the space…

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Answer 3

Hey Jean. They don't measure the bases of the toilet like that, but I can give you everything else you need to make sure the Thetford Aqua-Magic VI RV Toilet item #TH37SE will fit your space. Without the flush peddle the base measures…

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Answer 4

For your lead jack leg on your Lippert Venture Landing Gear VMC900R-327953, you will want to use the Lippert Venture Lead Leg Repair Kit for 5th Wheel RV Landing Gear #LC146059. As for a follow leg kit, you will want to use the Lippert Venture Follow…

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Answer 5

Hey Rodrigue, The Thetford Aqua-Magic Vi #TH24SE is going to have the similar design as the previous Aqua-Magic in it being hollow between the bowl and outer casting. I attached a photo of the toilet from below where it would attach to the black tank…

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Answer 6

Hey Steve, thanks for reaching out. The Dometic 410 RV Toilet #DMC44JF may work well in your 2020 Grand Design 320G, but unfortunately I don't have a way to verify the exact bathroom layout or factory toilet dimensions for your RV. Because of…

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Answer 7

Hey Jon, typically people replace the Dometic 310 RV toilet with the 410 which we have with the part #DMC64JF for a tan porcelain or the part #DMC44JF for a white porcelain. These are both standard height toilets with a round bowl and a slow close…

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Answer 8

Hey Samuel, thanks for reaching out! B&W has some of the bigger parts available through retailers like us, but for smaller parts they like to deal with customers directly, so they'll be able to identify any issues with their products quicker.…

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Answer 9

The correct replacement manual override handle for a Lippert tongue jack is the Lippert Electric Trailer Jack with Footplate part #LC285324. If the photo you have attached is of the jack you need a handle for then it will work though I am a bit…

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Answer 10

Hey David, great questions! I'll answer them in the same order you asked them: 1 - There isn't an official name for those brackets that I know of. They are part of the trailer frame so I guess technically they are pin box frame brackets, but…

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Answer 11

The Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapters are not specific to any one trailer frame manufacturer. The Reese Goose Box part #RP85FR in particular will fit any frame with the 0719, 1621 and 1621HD bolt pattern and the Reese…

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Best Toilet Replacement for a Thetford Model 31684

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