Thetford 42138 Aqua Magic Style II and Residence Replacement Base - Bone - High Profile

The Thetford 42138 Replacement Base is a genuine part designed for Aqua-Magic II and Residence RV toilets. This high-profile base provides a stable and durable foundation, ensuring proper alignment, secure installation, and reliable toilet performance.

If your existing toilet base is cracked, damaged, or worn, installing the 42138 base restores stability while maintaining the original height and fit of your RV toilet. Built to Thetford’s high-quality standards, this base is corrosion-resistant, durable, and easy to install for long-lasting use.

Maintain the structural integrity, comfort, and performance of your RV bathroom with the Thetford 42138 Replacement Base — an essential component for high-profile Aqua-Magic II and Residence toilets.

Features & Benefits

• OEM replacement base for Aqua-Magic Style II and Residence permanent toilets
• High-profile design raises toilet seat height for more comfortable use
• Bone-colored finish matches original Thetford toilet aesthetics
• Strong, vibration-resistant construction suitable for RV travel
• Correct mounting flange alignment — integrates with existing toilet plumbing and hardware
• Restores proper base support, eliminating leaks, movement, or cracks caused by wear or impact

Fits These Models

Compatible with:

• Thetford Aqua-Magic Style II (permanent toilets)
• Thetford Aqua-Magic Residence series toilets

Ideal for installations where increased seat height or updated base integrity is needed.

Common Issues Solved

Replacing with the 42138 base can fix:

• Cracked or broken toilet bases due to age or travel stress
• Shifting or unstable toilet installation on the floor flange
• Leaks around base or flange seal area
• Wear and structural degradation affecting toilet integrity
• Desire for a taller seat height for comfort or accessibility

Replaces / Also Known As

• Thetford 42138 Toilet Base Assembly (High Profile, Bone)
• Aqua-Magic Style II / Residence High-Profile Toilet Base — Bone Finish
• RV Toilet Base Replacement Shell

What’s Included

• 1 High-profile toilet base shell in Bone

(Seat, bowl, hardware, and flange seal not included — must reuse originals or purchase separately.)

Installation Overview

1. Turn off water supply and drain toilet components.
2. Remove toilet bowl and unscrew base from floor flange.
3. Detach old base and clean flange area thoroughly.
4. Position new 42138 base on flange and align bolt holes.
5. Secure with appropriate sealing and bolts.
6. Reinstall toilet bowl, reconnect water supply, and test for stability and leaks.
7. Confirm proper flush and water seal after reassembly.

Estimated installation time: 30–45 minutes depending on access and RV layout.

Frequently Asked Questions

Q: Will this base work with Style Lite or Style Plus toilets?
No. The 42138 base is meant for Style II and Residence permanent toilets only. Style Lite and Style Plus use different bases.

Q: Does the kit include mounting hardware and toilet components?
No — this listing includes only the base shell. Hardware, flange seal, bowl, and seat must be reused or purchased separately.

Q: Why choose the high-profile base?
It raises the toilet seat height, improving comfort for taller users or those who prefer a higher seating position.

Q: Is the “Bone” finish original to Aqua-Magic toilets?
Yes. Bone is the standard warm off-white color used by Thetford for many Style II and Residence toilets.

Q: Can I install this myself or should I hire a pro?
Most RV owners with basic tools can perform the replacement. However, depending on your RV layout, a second person may help with reinstalling the toilet bowl.