Thetford 20063974 (Superseded by 50526) Portable Waste Holding Tank – C4 Cassette® Toilet, Left Hand - SPECIAL ORDER

Product Overview

The Thetford 20063974 Portable Waste Holding Tank (now superseded by 50526) is a direct replacement waste tank designed for Thetford Cassette® C4 permanent RV toilets. This left-hand configuration tank restores proper waste storage and dependable operation for your cassette toilet system.

Ideal for replacing cracked, leaking, or worn tanks, this OEM replacement ensures proper fit and performance in compatible Thetford C4 toilet systems.

Special Order Item

• Estimated Lead Time: 2–3 Weeks
• Return Policy: This is a special order item and cannot be returned once ordered.

Key Features & Benefits

• Direct Replacement: Supersedes Thetford 20063974 with updated part 50526
• Designed for Cassette® C4 Toilets: OEM fit and function
• Left-Hand Configuration: Matches original factory orientation
• Restores Proper Waste Storage: Replaces damaged or leaking tanks
• Durable Construction: Heavy-duty plastic built for RV use
• Easy Installation: Slides directly into existing cassette compartment

Specifications

• Part Number: 20063974 (Superseded by 50526)
• Product Type: Portable Waste Holding Tank
• Toilet Compatibility: Thetford Cassette® C4 Permanent Toilets
• Orientation: Left Hand
• Material: Heavy-Duty Plastic

Fits These Models

• Thetford Cassette® C4 Permanent RV Toilets

Common Issues This Part Solves

• Cracked or leaking waste holding tank
• Odor escaping from damaged tank
• Difficulty removing or reinstalling old tank
• Worn or damaged original cassette tank

What’s Included

• (1) Thetford 50526 Portable Waste Holding Tank (Replacement for 20063974)

Installation Overview

1. Remove the existing cassette waste tank
2. Inspect seals and compartment area for debris or damage
3. Slide the new holding tank into position
4. Verify proper alignment and locking engagement
5. Test system for proper operation and sealing

FAQs

Q: Is Thetford 50526 the same as 20063974?
A: Yes—50526 is the direct replacement for the discontinued 20063974.

Q: What does “left hand” mean?
A: It refers to the orientation of the waste tank when installed. Match it to your existing tank configuration before ordering.

Q: Will this fit all cassette toilets?
A: No, this tank is specifically designed for Thetford Cassette® C4 permanent toilets.

Q: Does this include wheels or additional accessories?
A: No, this listing is for the waste holding tank only.

Why Choose Thetford?

Thetford is a trusted leader in RV sanitation systems, providing dependable OEM replacement parts designed for long-lasting performance and proper fit.