Port St. Lucie RV Repair fixes and replaces RV toilets on-site across Port St. Lucie, FL and the Treasure Coast. Dometic, Thetford, seal replacements, pedal rebuilds, full swaps. We come to you.
Port St. Lucie RV Repair fixes and replaces RV toilets on-site. Dometic, Thetford, and other brands. Seal replacements, foot-pedal repairs, flush valve rebuilds, and full toilet swaps. $100-280 depending on the job. We come to you anywhere in Port St. Lucie, FL and across the Treasure Coast. Call 772-276-6465. Need other RV plumbing repairs? We handle those too.
RV toilets work completely different from what you've got at home. No tank sitting behind the bowl, no gravity feed in most cases. Instead, you've got a foot pedal or hand lever that opens a blade seal or ball seal at the bottom of the bowl. That seal is the #1 failure point we see - on every brand, every model, every year.
When that seal dries out, cracks, or warps, water seeps past and slowly drains your fresh tank. Or worse, you start getting smells coming up from the black tank into the bathroom. In Florida's heat, a rubber seal can go from fine to cracked in a single summer if the RV sits unused. We replace these seals every single week across the Treasure Coast - it's probably the most common plumbing call we get in Port St. Lucie.
Beyond seals, we see foot-pedal mechanisms jam up from calcium buildup (Florida well water is brutal), water valves that won't shut off completely, and mounting flanges that leak because the foam gasket underneath has compressed flat after years of use. And sometimes the honest answer is that the toilet is done - a cracked bowl or a damaged flange means it's replacement time, not repair time.
Almost always a dried-out or cracked ball/blade seal. This is the most common call we get for toilet repairs. The bowl slowly drains down after flushing, and eventually you're looking at a dry bowl and sewer smell. $80-130 to fix, and we carry the seals on the truck.
Bad flange seal or loose mounting bolts. The wax ring equivalent in an RV is a foam or rubber gasket between the toilet base and the floor flange. After years of use it compresses flat and stops sealing. $70-120 to fix, and we check the subfloor for water damage while we're in there.
Spring mechanism failure or calcium buildup in the pedal linkage. Florida well water is loaded with minerals, and that calcium builds up inside the flush mechanism over time. A pedal rebuild kit is usually $100-150 installed. We can also flush the system to slow down future buildup.
Failed seal letting tank gas past, dried-out flapper, or a cracked vent line above the black tank. We check all three during a service call. If you've got tank sensor issues on top of the smell, we can check those at the same visit.
Low water pressure to the toilet (could be a valve upstream), clogged flush rim holes from calcium deposits, or a partially failed flush valve. On city water hookup this is less common, but on pump water the issue is usually a restriction somewhere between the pump and the toilet valve.
Honest answer: if the seal replacement is $80-130 and the toilet is under 8-10 years old, repair it. If the bowl is cracked, the mounting flange is damaged, or you're on your third seal in two years, a new Dometic 310 runs about $180-280 installed and will last another decade. We'll tell you straight which makes more sense.
Every RV toilet brand has its own seal design, mounting pattern, and failure modes. Here's what we see most often in Port St. Lucie and across the Treasure Coast, and what you should know about each one.
The most common gravity flush toilet in RVs today. The 310 is standard height, the 320 is the "tall" residential height version. All three use the same ball seal - part number 385311462 - and we keep those on the truck. According to Dometic's specifications, this seal is designed for 5+ years of use, but in Florida heat we see them go in 3-4. The ball mechanism is simple and reliable, but once that rubber dries out it's done.
Thetford uses a blade seal instead of a ball seal. The Aqua-Magic V is the entry-level model, Style II is mid-range, and Style Plus is the top of the line. The blade seal kit (part #31705 for Aqua-Magic V) is the most common Thetford part we replace. Blade seals warp rather than crack, and they tend to fail more gradually - you'll notice the bowl draining slower and slower over a few weeks before it stops holding water entirely.
Common in Class B vans and smaller trailers. These are self-contained units with a removable waste tank - no connection to a black tank. Seal failures and pump issues are the usual problems. The cassette models (C2, C4 series) use a different seal geometry that requires Thetford-specific parts. We work on both portable and permanently mounted cassette units.
Found in European-style and newer Class B builds like Winnebago Revels and Storytellers. Different seal geometry than the 300 series - these use a ceramic bowl with a separate cassette tank underneath. Parts availability is tighter on these, but we can source what's needed and usually get it within a couple days if we don't have it in stock.
Call 772-276-6465 or request an estimate online. Tell us what's happening - leaking seal, broken pedal, sewer smell, won't flush right. If you know the toilet brand and model, that helps us make sure we've got the right parts on the truck. We'll schedule you same or next day.
Our tech inspects the toilet, identifies the exact model, checks the seal condition, tests the flush mechanism and water valve. You get a written estimate before we start any work. Most toilet issues take about 15 minutes to diagnose - it's usually obvious once we pull the cover and look at the seal.
We carry Dometic 300-series ball seals, Thetford blade seal kits, flush valve assemblies, and replacement toilets on the truck. Most RV toilet repairs finish in under an hour. A full toilet swap takes 60-90 minutes. You're back to normal the same day - no ordering parts, no second visit.
| Repair Type | Price Range | Typical Time |
|---|---|---|
| Ball seal replacement (Dometic) | $80-130 | 45 min |
| Blade seal replacement (Thetford) | $80-120 | 45 min |
| Foot pedal / flush mechanism rebuild | $100-150 | 30-45 min |
| Water valve replacement | $60-100 | 30 min |
| Flange seal / mounting bolt repair | $70-120 | 30-45 min |
| Sprayer hose replacement | $40-80 | 20 min |
| Full toilet replacement (installed) | $180-280 | 60-90 min |
Toilet seal went bad on our fifth wheel right before a weekend trip. Called Friday afternoon, tech came out Saturday morning with the exact Dometic seal we needed. Done in 45 minutes, toilet works like new. Saved us from canceling the trip.
Had a terrible sewer smell in our motorhome for weeks. Tried every chemical and cleaning trick online. Turns out the Thetford blade seal was cracked. Tech replaced it in under an hour and the smell was completely gone. Should have called sooner.
Our old Dometic was cracked and the tech was honest about it - said repair wasn't worth it, recommended a new 310. Had one on the truck, swapped it out right there in the driveway. New toilet works great and the price was fair. No upsell, just straight talk.
RV toilet repairs typically run $80-280 depending on what's needed. A ball or blade seal replacement costs $80-130 parts and labor. A foot-pedal rebuild runs $100-150. A full toilet replacement with a new Dometic 310 or Thetford Aqua-Magic is $180-280 installed. We give you a written estimate before we start anything.
We replace RV toilets on-site every week. The toilet bolts to a flange on the floor with a gasket seal underneath. The whole swap takes 60-90 minutes including removing the old unit, prepping the flange, setting the new gasket, and connecting the water line. No reason to tow your rig anywhere for this job.
The biggest difference is the seal design. Dometic 300-series toilets use a ball seal that rotates open when you press the pedal. Thetford Aqua-Magic toilets use a blade seal that slides open. Both work fine, but they fail differently and need different parts. Dometic ball seals tend to dry out and crack. Thetford blade seals warp over time. We work on both brands daily across Port St. Lucie and the Treasure Coast.
Three telltale signs: the bowl won't hold water after flushing (it slowly drains down), you smell sewer gas even when the toilet looks clean, or you see water seeping around the base of the bowl when you flush. If water drains out of the bowl within a few hours, that's almost certainly a dried-out or cracked seal. It's the single most common RV toilet repair we do.
A seal replacement takes about 45 minutes. A full toilet swap runs 60-90 minutes. The removal and install isn't that long by itself, but we take time to inspect the flange, clean the mounting surface, and pressure-test everything before we call it done. A foot-pedal rebuild or water valve replacement is usually 30-45 minutes.
If the toilet smells after a thorough cleaning, the problem is almost always below the bowl. A failed ball or blade seal lets black tank gas seep up past the seal into the bathroom. A cracked vent pipe above the black tank can also cause this - the gas has nowhere to go but back through the toilet. We check both during a service call. The fix is usually a seal replacement at $80-130.
We handle all RV plumbing repairs - water pumps, water heaters, pipe leaks, tank valves, shower drains, and more. If you've got multiple plumbing issues, we can knock them all out in one service call across Port St. Lucie and the Treasure Coast.
We cover St. Lucie, Martin, and Indian River counties for all RV toilet repairs. From Vero Beach and Sebastian down through Fort Pierce, Port St. Lucie, Stuart, Palm City, and Jensen Beach.
Call us or request a free estimate. We'll get a tech out to your site with the right parts - same or next day. Seal replacements, pedal rebuilds, full toilet swaps. All done at your campsite or driveway.