Toto spares, Toto parts, Toto spare parts, Toto spare code no : THX174SF.Based on the publicly avail...

Toto spares, Toto parts, Toto spare parts, Toto spare code no : THX174SF.

Based on the publicly available TOTO spare parts information, THX174SF is not documented with detailed technical specifications or engineering drawings. It appears to be an internal TOTO spare part number that is not described in public parts catalogs.

Publicly available information does not include:

  • Part dimensions
  • Material specification
  • CAD or engineering drawings
  • Internal construction
  • Compatible model list

If you have the toilet seat or WASHLET model number that uses THX174SF (or a photo of the part or its label), I can help identify:

  • The exact function of THX174SF
  • Compatible TOTO models
  • Replacement procedure
  • Estimated dimensions and design (if you're reverse engineering it)
  • A technical drawing or CAD concept based on the identified component

At present, there is no verified public documentation that identifies THX174SF in the way parts such as THX70V3 or TC377-D1 are documented.

The TOTO THX174SF is identified in public TOTO spare-parts listings as a Diverter Assembly for selected TOTO shower/bath mixer faucets. Its purpose is to switch the water flow between different outlets, such as a hand shower and an overhead shower or bath spout.

Uses of THX174SF

  • Diverts water flow from one outlet to another (for example, from the shower head to the hand shower).
  • Controls outlet selection in multi-function shower or bath mixer faucets.
  • Restores proper switching when the original diverter becomes worn, leaks, or sticks.
  • Maintains smooth operation and helps prevent internal leakage between outlets.

Typical application

The THX174SF is used inside compatible TOTO concealed or exposed shower mixer valves as the internal diverter assembly. It is replaced when:

  • the diverter handle is difficult to operate,
  • water comes from two outlets at the same time,
  • the diverter leaks internally, or
  • the outlet selection no longer works correctly.

TOTO does not publicly provide detailed engineering drawings, internal dimensions, or material specifications for the THX174SF diverter assembly. Those details are generally available only through TOTO service documentation.

If you're looking to repair or manufacture a compatible THX174SF, I can also explain its likely internal construction (spool, seals/O-rings, spring, and valve body), operating principle, and provide a conceptual cross-sectional drawing based on standard diverter valve designs.

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Jul 28th, 2026 11:50 AM

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