TL;DR
- Thetford’s under-toilet riser lifts an RV toilet 2-1/2 inches. Thetford says it works with the Aqua-Magic IV, V, VI, Style II and Style Plus.
- Retailers list more toilets, but Thetford’s own page does not, so confirm your model first. Check your supply line, clearance, and flange before buying.
- If you need more height, compare your current seat plus 2-1/2 inches with the finished seat height of a replacement.
An RV toilet riser adds height without replacing your entire toilet. It sits between the floor flange and the toilet base, raising the existing seat by 2-1/2 inches. We compare the Thetford riser in its two color options with a high-profile replacement toilet, then explain how to confirm compatibility, measure clearance and prevent leaks. These are specification-based recommendations, not hands-on tests.
Our Top 3 Picks: RV Toilet Riser and Height Alternatives
The first two picks are color variants of the same Thetford riser; the third is a complete replacement toilet. We compared manufacturer specifications, not hands-on performance.
Thetford Toilet Riser, White
Model: 24967
2-1/2 inch lift · White · Under-toilet spacer
- Lifts the toilet 2-1/2 inches
- Keeps your current toilet
- Thetford lists Aqua-Magic IV, V, VI, Style II and Style Plus
Thetford Toilet Riser, Parchment
Model: 24818
2-1/2 inch lift · Parchment · Under-toilet spacer
- Same 2-1/2 inch lift as the white riser
- Color matches parchment toilets
- Same Thetford fit wording as 24967
Thetford Aqua-Magic VI
Model: 31835 (white, high profile)
About 17-3/4-inch seat height · 31835 white · High profile
- About 17-3/4-inch seat height on the high profile
- Replaces the whole toilet
- Offered in high or low profile
Check the exact model, water-line routing, flange and bathroom clearance before buying. Amazon buttons open model search results, not a guaranteed exact-match listing. Prices and star ratings are deliberately omitted.
| Model | Type | Height Gain or Seat Height | Main Limit |
|---|---|---|---|
| Thetford Toilet Riser, White, 24967 | Under-toilet riser | Lifts 2-1/2 inches | Adds 2-1/2 inches; confirm the exact toilet model |
| Thetford Toilet Riser, Parchment, 24818 | Under-toilet riser | Lifts 2-1/2 inches | Same rated lift as white; confirm fit and match color |
| Thetford Aqua-Magic VI (high profile) | Full toilet | Approximately 17-3/4-inch seat height | Full replacement job |
| Thetford Aqua-Magic Residence (high profile) | Full toilet | 18-inch seat height | Full replacement job |
Calculate the finished height: Measure from the bathroom floor to the top of your current toilet seat. For the compatible Thetford riser, add 2-1/2 inches. For example, a 16-inch seat becomes about 18-1/2 inches. A replacement toilet has a fixed published seat height, so compare that measurement separately.
Thetford 24967 White Toilet Riser: Best Under-Toilet Option
The 24967 white riser raises your current RV toilet 2-1/2 inches. It works best when your toilet is in good condition, the exact model is compatible and you need only a modest height change.
24967 Specs
Sources: White toilet riser – Thetford.
What We Like
- Smallest change to your bathroom
- Keeps the toilet you already own
What Could Be Better
- Only 2-1/2 inches of extra height
- Thetford’s own fit list is shorter than retailer lists
- The toilet has to come off the floor
Real-world suitability: This works for owners who need a modest lift and already have a listed Thetford toilet. Check the supply line and overhead room first (see the checklist below).
Comparison insight: It adds exactly 2-1/2 inches to your current seat; a complete replacement has a different fixed seat height.
Our verdict: A good first choice if your toilet is on Thetford’s list and 2-1/2 inches is enough.
Thetford Toilet Riser, Parchment, 24818: Best for Parchment Bathrooms
The parchment 24818 offers the same 2-1/2-inch rated lift as white 24967. Choose this color to match your existing toilet base; model compatibility and installation checks remain the same.
24818 Specs
Sources: Parchment toilet riser – Thetford.
What We Like
- Color-matched to parchment fixtures
- Keeps your current toilet
What Could Be Better
- Same 2-1/2 inch limit
- Same narrow fit list on Thetford’s page
Real-world suitability: The color is intended to match parchment toilets, but correct fit and clearance come first.
Comparison insight: It offers the same rated lift as the white version; choose based on color, compatibility and availability.
Our verdict: Choose parchment for a matching finish; it has the same rated lift as the white version.
Thetford Aqua-Magic VI, High Profile: Best Taller-Toilet Swap
A high-profile replacement is an option if the old toilet needs replacing or a compatible riser is unavailable. Thetford identifies models 31835 (white) and 31836 (parchment) as high profile. Its dimension sheet puts the seat height at about 17-3/4 inches. Measure your existing seat before assuming a replacement sits higher than a riser-equipped toilet.
High profile: 31835 white / 31836 parchment Specs
Sources: Aqua-Magic VI – Thetford, Permanent Toilets – Thetford.
What We Like
- An option when replacing an old toilet
- Fresh toilet and hardware
What Could Be Better
- Full replacement, so a bigger job
- SKU family includes low-profile versions, so pick the high-profile listing
Real-world suitability: A good fit if your current toilet is old or you need an appropriate finished seat height, and you are willing to replace the toilet.
Comparison insight: A full replacement may or may not end up taller than your current seat plus a riser.
Our verdict: Choose it when a riser will not fit or the toilet needs replacement, after comparing final seat heights.
Thetford Aqua-Magic Residence, High Profile: Best Home-Style Seat Height
The Aqua-Magic Residence has an approximately 18-inch high-profile seat height and a residential-sized soft-close seat. Thetford identifies 42169 (white) and 42171 (bone) as high-profile models. Its final seat height must be compared with your existing toilet plus a riser; it is not automatically a height upgrade.
High profile: 42169 white / 42171 bone Specs
What We Like
- Home-style height and seat
- Comfortable 18-inch finished seat height
What Could Be Better
- Full replacement job
- SKU set includes low-profile versions
Real-world suitability: Suits owners replacing an older toilet who value the full-size seat and approximately 18-inch height.
Comparison insight: The Residence is about 18 inches high versus the VI’s approximately 17-3/4 inches, and has different seat styling and dimensions.
Our verdict: Pick it if you want the taller seat and a more residential feel.
Which RV Toilet Height Fix Is Right for You?
An under-toilet riser lifts the whole toilet, a seat-top booster sits on the bowl, and a taller toilet replaces it. Thetford’s riser adds 2-1/2 inches and says it suits tall or physically challenged users. A replacement is not always higher than a riser-equipped toilet. For example, a current 17-inch seat plus a 2-1/2-inch riser becomes 19-1/2 inches, taller than an 18-inch replacement.
| Option | Height Gained | Install Effort | Trade-Off |
|---|---|---|---|
| Under-toilet riser | 2-1/2 inches (Thetford) | Lift the toilet and reseat it | Small gain; fit must be confirmed |
| Seat-top booster | Varies by product; check the exact booster specification | Sits on the bowl | Check bowl shape, secure attachment, foot-pedal clearance and stability |
| Taller toilet | 18-inch seat height (Thetford high profile) | Replace the whole toilet | Biggest job |
The booster is a category example, not a recommendation. Check your bowl shape (round or elongated) and how stable the booster feels. None of these options has a confirmed effect on foot pedal travel, flush action, or clearance, so check those yourself (see the checklist below). If you want a sturdier setup overall, see our guide to a taller, sturdier toilet.
Will the Thetford Riser Fit My Toilet?
Thetford’s current accessory pages list Aqua-Magic IV, V, VI, Style II and Style Plus. Older Thetford catalog materials describe broader Aqua-Magic compatibility, including Bravura, while excluding Aria. Retailers also mention Galaxy, Starlite, Aurora and some Dometic/SeaLand models. Because documents differ, confirm your exact model and the required flange gasket with Thetford before buying.
| Toilet | Thetford’s Page | Retailers Say | What to Do |
|---|---|---|---|
| Aqua-Magic IV, V, VI | Yes | Yes | Listed by Thetford; run the checklist below |
| Style II, Style Plus | Yes | Yes | Listed by Thetford; run the checklist below |
| Galaxy, Starlite, Aurora, Style Lite | Not listed | Yes | Confirm with Thetford first |
| Bravura | Not on current riser page; included in older Thetford literature | Often listed | Confirm your particular model and seal with Thetford |
| Aria | Not listed | Does not fit | Do not buy; consider a new toilet |
| Dometic/SeaLand 510, 910, 2010/2000 series, Traveler 110, 511 | Not listed | Yes (retailer-reported) | Confirm first; one retailer says a SeaLand gasket is sold separately |
One retailer names specific SeaLand models, while another says “most SeaLand models,” so SeaLand coverage is not settled. Older Thetford catalog documentation offers a broader fit description than the current accessory page, so neither a retailer listing nor an old catalog alone guarantees your specific installation. To identify your model, check the label on the toilet and Thetford’s serial number location guide on its Aqua-Magic VI support page. Our guide to how to identify your Thetford toilet can help.
How Do I Check My Bathroom Before Buying a Riser?
Before you order, confirm four things: your exact toilet model, where the water supply line enters, whether you have 2-1/2 inches of spare space overhead and beside the toilet, and whether the flange is sound. A riser raises the whole toilet, so a short supply line or a tight wall can stop the project.
- Check the model and label Match your toilet to the compatibility table above.
- Check the supply line routing Owners and publishers report the line may need to be lengthened. If it comes up through the floor, the riser may cover it and need a hole drilled. Do not drill a hole unless the correct manufacturer instructions identify the safe location for your kit and model. If unsure, call an RV technician.
- Check clearance Measure your current seat height, knee room, wall clearance, supply-line routing and lid-open clearance. The entire toilet rises 2-1/2 inches, including its lid and pedal.
- Check foot pedal and flush travel Confirm they still work at the new height instead of assuming.
- Check the flange Look for a soft floor, cracks, or corrosion. If your flange is damaged, fix that first.
What Does Installing an RV Toilet Riser Involve?
Installing a riser means draining the bowl, shutting off water, disconnecting the supply line, lifting the toilet off its flange, setting the riser on new seals, and remounting the toilet on the riser. Use the instruction sheet in your riser box, not a video or forum shortcut, because it covers seals, bolts, and hole locations. If the sheet is missing, contact Thetford before starting.
- Size of the job: This requires removing and reseating a toilet. Time varies with access, the water connection, floor condition and existing hardware.
- Seals: Inspect the kit’s flange seals and fasteners before starting. Use new seals specified by the manufacturer and do not stack or reuse compressed seals unless explicitly instructed. Other toilet brands may need different gaskets. If your kit has no seal that fits your toilet, see our toilet seal guide.
- Hardware: Use the fasteners and tightening sequence specified for your riser and toilet. Do not overtighten plastic hardware.
- Wobble check: Tighten the bolts only as the instruction sheet directs. If the toilet still rocks after that, stop rather than forcing the bolts (see the stop list below).
- Leak check: Reconnect the supply line without tension, restore water pressure and test several flushes. Check the water connection, base and surrounding floor immediately and after initial use.
Safety
- Lifting the toilet can release sewage odor and residue, spill water left in the bowl, and the toilet can tip in a tight bathroom. Wear disposable gloves, and ask a second person to help lift the toilet in a tight bathroom. Empty the black tank if practical, drain the bowl, switch off the RV water pump and campground water supply, and relieve pressure before disconnecting the line. Check the supply line connection before turning the water back on.
When Should You Stop and Call a Technician?
Stop if the flange is cracked or the floor around it feels soft, if the supply line will not reach without strain, if the toilet still rocks after tightening, or if anything leaks after remounting. At those points call the riser maker or a qualified RV technician instead of improvising.
Stop and get help
- Do not use a forum, video, or retailer workaround for pressurized water or sewage work. If your instruction sheet is missing, contact Thetford or a technician. Also stop if your toilet model is unconfirmed or is an Aria. If water seeps out after remounting, see our guide to a toilet leaking at the base.
How We Compared These Toilet Height Fixes
We did not test any of these products hands-on. We compared manufacturer pages and listings, and we do not give prices or star ratings. Retail listings give conflicting size figures for the riser, so this guide uses Thetford’s stated 2-1/2 inch lift. Award labels are editorial labels for this comparison, not claims about the best product in all RVs.
Manufacturer references: Thetford’s current accessory information and Aqua-Magic VI dimension sheet are useful starting points. Older compatibility documents may differ; verify your exact toilet model before modifying the installation.
How to Choose
If 2-1/2 Inches Is Enough
Choose a Thetford riser if your toilet is on Thetford’s list. Pick white or parchment to match your toilet.
If You Need More Height
Compare your current seat plus 2-1/2 inches with an Aqua-Magic VI high profile (about 17-3/4 inches) or Residence high profile (about 18 inches). Choose by final height and verified fit, not the high-profile label alone.
If Your Toilet Is Not on Thetford’s List
Treat retailer-only compatibility as unconfirmed. Confirm with Thetford, or replace the toilet instead. Aria toilets are reported as not compatible.
RV Toilet Riser FAQs
Will a Thetford toilet riser fit a Dometic or SeaLand toilet?
Some retailers list selected Dometic/SeaLand models, but they are not on Thetford’s current riser accessory page. Confirm your exact toilet model and flange-seal requirements with Thetford before buying.
Do I need a new flange seal with a toilet riser?
Use new seals specified in the kit’s installation instructions. Do not reuse flattened seals or stack extra seals unless the manufacturer explicitly directs it.
Can I install an RV toilet riser myself?
Many owners can remove and reseat a compatible toilet, but you must disconnect a water line and reseal the flange. Shut off and depressurize the water supply and stop if the flange, floor or line needs repair.
Is a high-profile RV toilet always taller than a riser?
No. The riser adds 2-1/2 inches to your existing seat, while a replacement has its own fixed seat height. Measure and compare final heights before ordering.
Final Verdict
The Thetford white riser is a sensible option if compatibility is confirmed and a 2-1/2-inch lift is enough. Choose the parchment riser only to match a parchment toilet, and confirm its part number with Thetford first. If your model is incompatible or your old toilet needs replacement, compare verified replacement height and fit rather than assuming a new high-profile model is taller.
Three takeaways: the Thetford riser adds 2-1/2 inches, confirm fit with your model label and Thetford’s own list, and check the supply line, clearance, and flange before buying. Your next step is to check your toilet’s model, then read our RV toilet replacement guide if the riser will not fit.
