Toto spares, Toto parts, Toto spare parts, Spare code no : TT2105 - Foaming cap,
Based on that, here is what can be inferred about TT2105 (Foaming Cap), what you should check, and how to identify the correct replacement.
What a Foaming / Foam Cap Does in Faucets
A “foaming cap” or “foam cap” is the aerator insert or device that mixes air with water at the outlet of a faucet to produce a smooth, aerated (bubbled) flow rather than a full solid stream. Some key points:
- It typically sits at the mouth (tip) of the faucet spout (or in the spout’s end fitting).
- It contains internal mesh / honeycomb / media that force the water to entrain air, reducing splashing and lowering perceived flow while maintaining comfortable pressure.
- The “cap” nomenclature suggests it is screwed or fitted into the end of the spout (often removable for cleaning or replacement).
- It may have a specific thread (or size) and seating gasket to seal properly.
In the case of TOTO’s THYB68‑1, the foam cap has:
- A thread diameter of M24
- Is made of brass material (as per listing)
So, TT2105 is likely similar in concept, but for a different faucet series or design.
What to Determine / Measure to Get the Correct TT2105 or Equivalent
Because I did not find a direct spec sheet, to identify or replace “TT2105 – Foaming Cap” you should check / measure:
Parameter / FeatureWhat to Measure / ObserveWhy It MattersThread Diameter & TypeUnscrew the existing foam cap (if present) and measure the outer thread diameter (in mm) and confirm whether thread is metric, BSP, NPT, or other.Ensures the replacement screws in and seals properly.Thread Pitch / Thread CountUse a thread gauge or compare to known threads to identify pitch.A mismatch in pitch means the part won’t screw in fully or will cross-thread.Overall Outer / Inner DiameterMeasure how wide the foam cap body is (outer shell) and inside opening.To ensure the mesh / internal media fits without interference in the spout.Flow / Mesh / Aerator Media Pattern / Orifice SizeObserve the aerator mesh or hole size inside the cap.To match the intended flow / feel / water performance.Sealing / Gasket / O‑Ring TypeInspect if there is a sealing O‑ring or flat gasket at the base of the foam cap.Necessary for water-tightness, especially under pressure.Material / FinishInspect whether it is brass, chrome plated, plastic insert, etc.To match durability, corrosion resistance, and aesthetics.Tap / Faucet Model CompatibilityNote which faucet or spout the foaming cap is intended for (model of faucet).The spare parts catalog or dealer may list TT2105 under specific faucet models.
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