Description
Product Overview
The Thetford 1638478 Portable Waste Holding Tank Cap (now superseded by 50130) is a direct replacement dump cap designed for Thetford 200 Series cassette portable toilets. This cap securely seals the waste tank outlet, helping prevent leaks, spills, and odors during transport and disposal.
Special Order – Estimated 2–4 Week Lead Time
Please note: This is a special order item.
- Estimated lead time: approximately 2–4 weeks
- Lead times may vary based on manufacturer availability
- Special order items are non-cancelable and non-returnable once processed
- Please verify fitment, dimensions, and specifications before placing your order
Key Features & Benefits
- Direct Replacement: Supersedes Thetford 1638478 with updated part 50130
- Secure Seal: Helps prevent leaks and odor escape during transport
- Designed for 200 Series: Specifically fits Thetford cassette portable toilet waste tanks
- Durable Construction: Built from high-quality plastic for long-lasting use
- Easy Installation: Simple twist-on design for quick replacement
- Bright Yellow Color: Easy to identify and locate
Specifications
- Part Number: 1638478 (Superseded by 50130)
- Product Type: Waste Holding Tank Dump Cap
- Toilet Compatibility: Thetford 200 Series Cassette Toilets
- Color: Yellow
- Material: Durable Plastic
Fits These Models
- Thetford 200 Series Cassette Portable Toilets
Common Issues This Part Solves
- Missing or damaged dump cap
- Waste tank leaks during transport
- Odor escaping from tank outlet
- Cracked or worn cap threads
What’s Included
- (1) Thetford 50130 Portable Waste Holding Tank Dump Cap (Replacement for 1638478)
Installation Overview
- Remove the old or damaged cap from the waste tank
- Inspect threads for debris or damage
- Thread the new cap onto the tank outlet
- Tighten securely to ensure a proper seal
FAQs
Q: Is Thetford 50130 the same as 1638478?
A: Yes—50130 is the direct replacement for the discontinued 1638478.
Q: Will this fit all cassette toilets?
A: No, it is specifically designed for Thetford 200 Series cassette toilets.
Q: Does this include the full waste tank?
A: No, this is only the dump cap, not the tank assembly.
Q: What happens if I don’t replace a damaged cap?
A: You may experience leaks, spills, or odors, especially during transport.
Why Choose Thetford?
Thetford is a trusted leader in RV sanitation, offering reliable replacement parts that ensure clean, safe, and efficient waste management.
