Description
Product Overview
Fix your leaking, wobbling RV toilet in one repair with this complete seal kit for Dometic 300, 310, and 320 series gravity-flush toilets — the most popular RV toilet lineup in North America. This kit includes the 385311653 closed-cell foam floor seal to stop water and odor leaks at the base AND the 385311652 stainless steel mounting hardware kit (bolts, washers, nuts) to eliminate toilet wobble caused by corroded or stripped fasteners. One kit, one repair, problem solved.
Key Features
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Complete Seal + Hardware Kit — Includes both the 385311653 closed-cell foam floor seal AND the 385311652 stainless steel bolt kit — everything you need for a complete toilet base repair.
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Closed-Cell Foam Construction — Unlike open-cell foam that acts like a sponge, closed-cell foam creates a true water barrier that won't wick moisture or absorb odors over time.
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Stainless Steel Hardware — The 385311652 bolts, washers, and nuts are stainless steel — they won't rust or corrode in the humid RV bathroom environment, unlike the factory carbon steel fasteners.
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Perfect Fit for Dometic 300/310/320 — Precision-cut to match the Dometic gravity-flush toilet base flange exactly. Same seal interface on the standard 300, low-profile 310, and elongated 320 models.
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DIY-Friendly Installation — 30-45 minute job with basic hand tools. No special plumbing skills required. Full instructions included.
Compatibility / Fitment
| Brand |
Series |
Type |
Common Models |
| Dometic |
300 |
Standard Height, Gravity Flush |
Dometic 300 |
| Dometic |
310 |
Low Profile, Gravity Flush |
Dometic 310 |
| Dometic |
320 |
Elongated Bowl, Gravity Flush |
Dometic 320 |
Technical Specifications
| Specification |
Value |
| Seal Part Number |
385311653 |
| Hardware Part Number |
385311652 |
| Seal Material |
Closed-Cell Foam |
| Hardware Material |
Stainless Steel |
| Flush Type |
Gravity Flush |
| Installation Time |
30-45 Minutes |
Why Choose This
RV dealers charge $150-250 for this simple repair. This kit gives you everything needed to do it yourself in under an hour. The factory carbon steel bolts on Dometic toilets are notorious for rusting solid in the humid bathroom environment — our stainless steel hardware eliminates this problem permanently. The closed-cell foam seal won't degrade or absorb moisture like cheap open-cell alternatives. If your toilet is leaking at the base, rocking when you sit, or emitting sewer odors, this kit is the definitive fix.
Related Products
Frequently Asked Questions
Q: Does this fit the Dometic 310 low-profile model?
A: Yes. The 385311653 seal interface is identical across all three Dometic gravity-flush models — the standard-height 300, low-profile 310, and elongated 320. The bolt pattern and flange design are the same.
Q: How do I remove rusted factory bolts?
A: If the original carbon steel bolts are heavily rusted, spray them with penetrating oil (PB Blaster or WD-40) and let sit for 15 minutes. Use a 6-point socket (not 12-point) to avoid rounding. If the bolt head snaps, the toilet will lift off the broken stud — remove the remainder with vice grips from underneath.
Q: How tight should I torque the new bolts?
A: Hand-tighten until the toilet feels firmly seated, then turn an additional 1/4 turn with a wrench. DO NOT overtighten — excessive torque can crack the ceramic toilet base or deform the plastic flange. The foam seal does the sealing work, not bolt pressure.
Q: What are the signs my toilet seal needs replacement?
A: Watch for: water pooling around the toilet base after flushing, a persistent sewer odor near the toilet (even with the fan running), the toilet rocks or wobbles when you sit, visible water staining on the floor around the base, and corroded or stripped mounting bolts.
Q: Can I reuse the old bolts if they look okay?
A: We strongly recommend replacing the bolts with the new stainless steel hardware included in this kit. Factory bolts that look okay externally may be heavily corroded inside the flange — and carbon steel will eventually rust. Stainless hardware is a permanent upgrade.
Q: Do I need to remove the toilet completely?
A: Yes. The seal sits between the toilet base and the floor flange. You must lift the toilet off the floor to access and replace the old seal. Shut off the water supply, disconnect the water line, and remove the mounting bolts to lift the toilet.
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