CATIS WC Siphon Seal | TPU85A Mushroom Gasket
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Bill of Materials
Description
CATIS Siphon Piston Seal (Mushroom Valve) – TPU 85A Replacement
This replacement piston seal was designed to restore the functionality of the classic CATIS siphon, replacing the original rubber "mushroom" gasket that often becomes hard, cracked, or deformed over time.
After testing, the seal provides excellent closure and smooth operation when printed with flexible TPU filament.
Important Printing Instructions
⚠️ This part MUST be printed in TPU 85A or softer.
Recommended materials:
- TPU 85A (ideal)
- TPU 80A
- Very soft TPE filaments
Harder materials such as PETG, PLA, ABS, ASA, or TPU 95A are not recommended, as they may not seal properly against the siphon seat.
Recommended Print Orientation
For maximum durability, flexibility, and sealing performance:
✅ Rotate the model approximately 45° upward before slicing.
Printing at a 45° angle:
- Improves layer adhesion in the most stressed areas
- Produces a smoother sealing surface
- Reduces the risk of layer separation
- Increases service life
- Provides better conformity to the valve seat
Print Settings
- Material: TPU 85A
- Layer Height: 0.16 – 0.20 mm
- Walls: 4–5
- Infill: 100%
- Print Speed: 20–35 mm/s
- Supports: Recommended when printed at 45°
- Cooling: Moderate
Installation
- Remove the old damaged seal.
- Clean the valve rod and seating surface.
- Install the new TPU seal onto the piston stem.
- Verify smooth movement of the piston.
- Reassemble the CATIS siphon and test for proper sealing.
Why This Model?
Many CATIS siphons are still mechanically sound, but replacement seals are difficult or impossible to find.
This model allows you to:
- Restore the original siphon
- Avoid replacing the entire assembly
- Extend the life of vintage plumbing components
- Save money while reducing waste
If this model helped bring your CATIS siphon back to life, a Like, Download, or Boost is greatly appreciated and helps support future restoration projects.
Happy Printing! 🚀
Suggested Tags
CATIS, Siphon, Toilet, WC, Flush Valve, Piston Seal, Mushroom Seal, Rubber Seal, TPU, Flexible TPU, Plumbing Repair, Toilet Repair, Vintage Plumbing, Restoration, Replacement Part, Bathroom, DIY Repair, Functional Print, TPU85A, Flexible Print, Water Seal, Drain Valve, Flush Mechanism, MakerWorld, Spare Part
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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