The water seal is a critical component in your Dometic RV toilet that prevents odors and waste gases from backing up into your bathroom. This genuine OEM seal fits Dometic 300, 310, and 320 series toilets and maintains a watertight barrier between the bowl and the waste tank. If your toilet is releasing foul odors or you notice reduced water levels in the bowl, a worn or damaged water seal is likely the culprit.
Key Features
- Genuine OEM Dometic part — exact factory replacement
- Fits Dometic 300, 310, and 320 series RV toilets
- Prevents odor and gas backup into living space
- Easy DIY installation — no special tools required
- Durable rubber construction withstands RV vibration and temperature changes
- Maintains proper water level in toilet bowl
Technical Specifications
| Specification | Details |
|---|---|
| Part Number | 385311850 |
| Compatible Models | Dometic 300, 310, 320 Series |
| Material | Rubber |
| Type | Water Seal Gasket |
Frequently Asked Questions
How do I know if my water seal needs replacement?
Common signs include persistent odors coming from the toilet even after cleaning, water not holding in the bowl, or visible cracks and deterioration on the seal itself. If your toilet has been in service for several years, preventive replacement is a good idea.
Is this a difficult installation?
No. Most RV owners can replace the water seal in 15–30 minutes. You'll need to remove the toilet bowl from the base, unscrew the old seal, and install the new one. Your Dometic manual includes step-by-step instructions, and our support team is available if you have questions.
Will this seal work on my specific Dometic model?
This seal is designed for Dometic 300, 310, and 320 series toilets. If you're unsure of your model, check the nameplate on your toilet or provide us your RV's year and make — we can confirm compatibility before you order.
Why Choose Elkhart RV Parts
We specialize in hard-to-find Dometic RV replacement parts and ship directly from Elkhart, Indiana — the RV capital of the world. Every part we sell is genuine OEM Dometic stock, backed by expert customer support. When you need the exact seal your toilet requires, we have it in stock and ready to ship.
| Product_name | Dometic RV Toilet Water Seal |
|---|---|
| Part_number | 385311850 |
| Manufacturer | Dometic |
| Product_type | Water Seal |
| Category | RV Toilet Parts |
| Part_status | OEM Replacement |
| Compatible_series | 300310320 |
| Compatible_toilet_models | Dometic 300/310/320 Series |
| Weight_lbs | 13.56 |
| Dimensions | 18" x 12" x 12" |
| Function | Water seal and flush function restoration |
| Installation_difficulty | Straightforward |
Factory-Fresh OEM Parts — the same brands installed in new RVs straight from Elkhart. Genuine, name-brand components made to order — never generic, never outdated. Sourced directly from the original RV manufacturers for perfect fit and factory-level quality.