Thetford Toilet Flush Mechanism Replacement for Cassette® C-402C / C-402X / C-403L Toilets - 3233206

The Thetford Toilet Flush Mechanism is an OEM-correct manual flush assembly designed for Thetford Cassette® C-402C, C-402X, and C-403L permanent toilets. This left-hand, gray manual flush mechanism includes the slide valve and float, restoring smooth flush operation, proper sealing, and reliable waste control.

Ideal for repairing stiff operation, incomplete blade movement, leaks, or float-related issues, this replacement allows you to service the flush system without replacing the entire toilet.

Key Features & Benefits

• OEM-Correct Replacement – Manufactured to Thetford specifications
• Manual Flush Operation – Simple, reliable control without electronics
• Complete Assembly – Includes slide valve and float for full functionality
• Restores Smooth Blade Movement – Fixes sticking or incomplete flushing
• Improves Odor & Leak Control – Ensures proper sealing at the cassette opening
• Cost-Effective Repair – Replaces failed internal components, not the whole toilet

Fits / Compatible With

• Thetford Cassette® C-402C Permanent Toilet
• Thetford Cassette® C-402X Permanent Toilet
• Thetford Cassette® C-403L Permanent Toilet

Important:

• Manual flush only
• Left-hand configuration
• Gray finish

Not compatible with electric-flush cassette models, Porta Potti®, Aqua-Magic®, or Tecma toilets.

What’s Included

• (1) Manual Flush Mechanism
• Integrated Slide Valve
• Float Assembly

Specifications

• Flush Type: Manual
• Orientation: Left-hand
• Color: Gray
• Application: Cassette toilet flush control
• Brand: Thetford

Common Issues This Part Solves

• Flush handle difficult to move
• Blade not opening or closing fully
• Leaks or odors from cassette opening
• Damaged or worn slide valve
• Faulty float operation inside the cassette system

Installation Overview

1. Remove cassette tank from the toilet
2. Access the internal flush mechanism
3. Remove worn or damaged components
4. Install new flush mechanism, slide valve, and float
5. Reassemble toilet and test operation

Basic hand tools required. DIY-friendly for most RV owners.

Frequently Asked Questions (FAQ)

Is this an OEM Thetford replacement part?

Yes. This flush mechanism is manufactured to Thetford OEM specifications for proper fit and performance.

Which toilets does this flush mechanism fit?

It fits Thetford Cassette® C-402C, C-402X, and C-403L permanent toilets with manual, left-hand flush operation.

Does this include the slide valve and float?

Yes. The assembly includes both the slide valve and float, making it a complete replacement.

Is this for manual or electric flush toilets?

This part is for manual flush cassette toilets only. It will not work with electric flush control systems.

How do I tell if I need a left-hand version?

Left-hand orientation refers to the side of the toilet where the flush control is operated when facing the toilet. Compare to your existing mechanism before ordering.