Dometic | Replacement Flush Ball Seal Kit | fits 300/301/310/311/320/321 | 385311658

Keep your RV toilet operating smoothly with the Dometic Replacement Ball Seal Kit (385311658). This essential component is designed to create a watertight seal in the toilet’s waste valve, preventing leaks and ensuring reliable flushing performance. Compatible with multiple models, including 300, 301, 310, 311, 320, and 321, this ball seal kit is a must-have for RV owners looking to maintain a clean and efficient bathroom system.

Made from durable, high-quality materials, the Dometic ball seal kit resists wear and tear, providing long-lasting performance and preventing costly leaks. Installing a new ball seal restores the proper function of your RV toilet, ensuring that waste is properly contained and flushed away without any mess or odor.

Ideal for routine maintenance or emergency replacements, this OEM-quality part is easy to install and designed to fit perfectly in your Dometic toilet system. By replacing a worn or damaged ball seal, you can extend the life of your toilet, maintain hygiene, and enjoy a fully functional RV bathroom on every trip.

Whether you’re an experienced RV owner or a first-time maintainer, the Dometic Replacement Ball Seal Kit (385311658) ensures your toilet remains leak-free, reliable, and ready for all your adventures.

Key Features

• OEM replacement flush ball seal for Dometic 300, 301, 310, 311, 320, 321 Series toilets
• Ensures tight sealing for efficient flushing and water conservation
• Durable, long-lasting construction for RV and marine use
• Easy to install with existing toilet hardware
• Prevents leaks and maintains optimal toilet performance

Compatible Series & Models

• Traveler / Standard Series: 300, 301, 310, 311, 320, 321

Confirm your toilet model matches these series before ordering.

Replaces / Also Known As

• Dometic 385311658 Flush Ball Seal Assembly
• Toilet Ball Seal Replacement
• OEM Dometic Flush Ball Seal
• 300/301/310/311/320/321 Series Toilet Seal

What’s Included

• 1 Flush ball seal kit (OEM Dometic part)

Installation

1. Turn off water supply and remove the toilet from the floor flange if necessary.
2. Remove the old flush ball seal from the toilet assembly.
3. Clean the mounting surface and install the new flush ball seal.
4. Reassemble the toilet, reconnect water lines, and secure the toilet.
5. Test for leaks and proper flushing operation.

Installation typically takes 15–30 minutes using standard tools.

Frequently Asked Questions

Q: Will this seal fit Dometic 110 or 111 toilets?
No, this kit is specifically designed for Dometic 300, 301, 310, 311, 320, 321 Series toilets.

Q: Is this an OEM Dometic part?
Yes, this is a genuine Dometic replacement flush ball seal.

Q: Can I replace this myself?
Yes, basic plumbing skills are sufficient. Always turn off the water supply before starting.

Q: Does this prevent leaks completely?
Yes, when installed correctly, it ensures a tight seal for proper flushing performance.