Thetford Blade Seal For Aqua Magic V & VI High And Low Toilets

The Thetford 31708 Blade Seal is a genuine replacement part designed for Aqua Magic V and VI RV toilets, including both high-profile and low-profile models. This seal ensures a tight, leak-free connection within the toilet’s waste system, preventing leaks, odors, and inefficient flushing.

If your Aqua Magic V or VI toilet is experiencing leaks, poor flushing, or a compromised seal, installing the 31708 Blade Seal restores proper operation and water-tight performance. Manufactured to Thetford’s high-quality standards, the blade seal is durable, easy to install, and engineered for a precise fit.

Maintain the hygiene, reliability, and efficiency of your RV toilet with the Thetford 31708 Blade Seal — an essential component for smooth, leak-free operation in Aqua Magic V & VI toilets.

Features & Benefits

• OEM blade seal designed specifically for Thetford Aqua-Magic V & VI toilets
• Ensures a watertight seal for proper bowl water retention
• Prevents odors from escaping through the waste valve
• Restores smooth blade movement for reliable flushing
• Made from durable, flexible rubber designed for long-term use
• Ideal low-cost repair for common toilet performance issues

Fits These Models

Compatible with:

• Aqua-Magic V – High Profile & Low Profile
• Aqua-Magic VI – High Profile & Low Profile

Works with the factory waste valve/blade assembly for both generations.

Common Issues Solved

Replacing the 31708 blade seal can fix:

• Toilet bowl that won’t hold water
• Persistent sewer odors from the toilet
• Slow or incomplete blade closure
• Leaks around the waste ball/blade area
• Sticking or noisy blade operation due to worn rubber

Replaces / Also Known As

• Thetford 31708 Blade Seal
• Waste Valve Seal / Blade Gasket
• RV Toilet Waste Ball Seal
• Aqua-Magic V & VI Waste Seal Replacement

What’s Included

• 1 OEM blade seal (rubber gasket) for Aqua-Magic V & VI toilets

Installation Overview

1. Turn off the RV water supply.
2. Flush to empty the bowl and access the blade area.
3. Disassemble the blade/waste valve area as needed (access varies by RV).
4. Remove the old seal and clean the sealing surfaces thoroughly.
5. Install the new 31708 seal in the same orientation.
6. Reassemble components and test for bowl water retention.

Typical installation time: 15–25 minutes, depending on access.

Frequently Asked Questions

Q: My toilet bowl slowly drains water—will this fix it?
Yes. A worn blade seal is the #1 cause of a bowl losing water.

Q: Does this fit Aqua-Magic IV or Style II?
No. This seal is only for Aqua-Magic V & VI models.

Q: Is this an OEM Thetford part?
Yes — 31708 is the genuine factory replacement seal.

Q: Do I need to remove the entire toilet?
Sometimes access is possible without removal, but many RVs require removing the toilet for easier installation.

Q: How often should the blade seal be replaced?
Typically every 2–4 years, depending on water quality and usage.