Current Part Number: 50141 | Previous Part Number: 3233206 (TH3233206)
Genuine Thetford OEM replacement full blade seal mechanism for the C-402C cassette toilet. Replaces the complete blade and seal assembly in the cassette holding tank — restoring proper sealing to prevent odors and leaks. OEM part engineered specifically for Cassette C-402C compatibility.
The Thetford C-402C is a built-in cassette toilet used in motorhomes, campervans, and RVs — and the blade seal mechanism is the heart of how it seals the holding tank from the toilet bowl. Over time, the blade seal wears, hardens, or deforms, causing the classic cassette toilet problem: odors escaping upward from the holding cassette into the living space, or water failing to stay in the bowl.
The Thetford 50141 is the current OEM replacement for the complete full blade seal mechanism — not just the seal itself, but the entire blade and seal assembly. Sourcing an OEM Thetford replacement ensures an exact fit and proper sealing performance without the guesswork of aftermarket alternatives. This part was previously catalogued under part number 3233206 (TH3233206) — both numbers refer to the same component, with 50141 being the current active part number in Thetford's product lineup.
Exact replacement engineered by Thetford for the C-402C — guaranteed fit and performance vs. aftermarket alternatives
Full blade seal mechanism — replaces the complete assembly, not just the seal strip, for a thorough repair
A properly sealed blade mechanism prevents holding tank odors from escaping upward and keeps water in the bowl
Current part 50141 supersedes the previous catalogue number 3233206 — same component, updated numbering
The 50141 Full Blade Seal Mechanism is specifically designed for the Thetford Cassette C-402C. Before ordering, confirm: 1. Toilet model: Check the model label on your cassette toilet or holding tank — typically found on the cassette or on a label inside the toilet cabinet. Confirm it is the C-402C. 2. Part number cross-reference: If you are sourcing based on the previous part number 3233206 or TH3233206, part 50141 is the confirmed current replacement. 3. This is not a universal Thetford blade seal — other Thetford cassette models (C-200, C-250, C-260, C-400) use different mechanism parts. Confirm C-402C compatibility before purchasing. Contact Thetford customer support at (800) 543-1219 if you are uncertain which part number is correct for your specific cassette toilet model.
In a Thetford cassette toilet, the blade seal mechanism is the sliding or rotating blade assembly that sits between the toilet bowl and the removable cassette holding tank below. When the toilet is not being flushed, the blade closes to seal the cassette from the bowl — preventing odors from rising up into the toilet and living space, and keeping water in the bowl. When you flush, the blade opens momentarily to allow waste to pass into the cassette, then closes again automatically. Over time, this mechanism's seal surface wears or deforms, causing it to no longer close tightly — resulting in odor escape and water loss from the bowl. The 50141 Full Blade Seal Mechanism replaces the complete assembly to restore proper sealing function.
Replacement of the full blade seal mechanism on a Thetford C-402C cassette toilet involves accessing the mechanism assembly within the toilet's cassette interface. Thetford recommends: • Empty and clean the cassette before beginning repair • Refer to the Thetford C-402C service manual or installation guide for step-by-step disassembly and reassembly instructions • Service documentation is available at thetford.com or by contacting Thetford customer support If you are unfamiliar with cassette toilet mechanism repair, Thetford recommends having the replacement performed by an authorized service center or qualified RV technician.
In The Package: • (1) Full Blade Seal Mechanism Assembly — Thetford Part 50141 NOT Included: • Installation tools • Other cassette seal components (hub seal, closet flange seal — sold separately if needed)
Thetford Customer Support: Phone: (800) 543-1219 Website: thetford.com Thetford is the world's leading manufacturer of mobile sanitation products for RV, marine, camping, and truck markets. Contact Thetford to confirm part compatibility with your specific cassette toilet model before ordering.