Thetford Closet Flange Seal For Aqua-Magic RV Permanent Toilets - 33239

The Thetford 33239 Closet Flange Seal is a genuine replacement part designed for permanent RV toilets. This seal ensures a tight, leak-free connection between the toilet base and the RV waste outlet, preventing water and waste leaks while maintaining proper alignment.

If your RV toilet is leaking, emitting odors, or showing signs of a worn or damaged flange seal, installing the 33239 seal restores a secure and hygienic connection. Built to Thetford’s high-quality standards, this seal is durable, easy to install, and precisely engineered for a perfect fit.

Maintain your RV bathroom’s safety, hygiene, and performance with the Thetford 33239 Closet Flange Seal — an essential component for reliable, leak-free operation of permanent RV toilets.

Features & Benefits

• Genuine Thetford OEM closet flange seal
• Creates a watertight and odor-tight connection between toilet and floor flange
• Prevents leaks, rocking, and sewer gas intrusion
• High-quality rubber withstands constant compression, vibration, and temperature changes
• Quick, easy installation—ideal for RV technicians and DIY owners
• Restores proper toilet stability for improved comfort and performance

Fits These Models

The 33239 Closet Flange Seal fits the following Thetford permanent RV toilets:

• Aqua-Magic Residence
• Aqua-Magic Style II
• Aqua-Magic Style Plus
• Aqua-Magic VI
• Aqua-Magic Bravura
• Aqua-Magic IV
• Aqua-Magic V
• Aqua-Magic Galaxy
• Aqua-Magic Starlite
• Aqua-Magic Style Lite

This is one of Thetford’s most widely used flange seals across multiple product generations.

Common Issues Solved

Replacing the 33239 flange seal can resolve:

• Water leaking at the base of the toilet
• Sewer odors escaping into the RV
• Toilet rocking or shifting on the flange
• Poor or uneven toilet seating
• Gaskets that have flattened, cracked, or deteriorated over time

Replaces / Also Known As

• Thetford 33239 Seal
• RV Toilet Base Seal / Floor Seal
• Closet Flange Gasket
• Permanent RV Toilet Mounting Seal
• Thetford Bowl-to-Flange Seal

What’s Included

• 1 OEM rubber closet flange seal

(No hardware required—mounting bolts are separate.)

Installation Overview

1. Turn off the RV water supply and disconnect the toilet.
2. Remove the worn or damaged flange seal.
3. Clean the flange surface thoroughly.
4. Position the new 33239 seal evenly over the flange.
5. Set the toilet back in place, aligning the bolt holes.
6. Tighten mounting bolts evenly to ensure proper compression and stability.
7. Reconnect the water line and test for leaks or wobbling.

Typical installation time: 10–20 minutes.

Frequently Asked Questions

Q: Can I use sealant with this gasket?
No. The seal is designed to compress dry for a proper fit.

Q: Will this stop odors coming from the tank?
Yes. A failed closet flange seal is one of the most common odor sources in RV bathrooms.

Q: Do I need to remove the toilet completely?
Yes, the toilet must be lifted to access and replace the flange seal.

Q: Is this an official Thetford replacement part?
Yes—the 33239 is a genuine OEM seal used across many Thetford models.