Toto spares, Toto parts, Toto spare parts, spare code no : TT6501 - Flow regulator in stop valve,
However, here are useful steps, inferences, and what to look for to identify or replace the TT6501 flow regulator:
What a “Flow Regulator in Stop Valve” Typically Means
- A flow regulator (or flow restrictor) inside a stop valve is a small insert or mechanism that limits the water flow rate even when the valve is fully open.
- Its purpose is often to control flow, reduce water consumption, maintain pressure balance, or provide a safe maximum flow in certain fittings (e.g. washlets, sensor faucets, bidet toilets).
- In a stop valve (angle valve / shutoff valve), the regulator is often an insert, mesh / screen, or orifice that sits within the valve body.
- The stop valve’s handle or shutoff mechanism still works fully, but the flow through it is limited by the regulator.
What to Check / Measure to Replace or Source It
Because TT6501’s specs are not easily available, you’ll need to measure or inspect the existing regulator. Here’s what to check:
Parameter / FeatureHow to Measure / IdentifyWhy It’s ImportantValve / Stop Valve Brand & ModelIdentify the stop valve (angle valve, inline stop, washlet shutoff) that contains the TT6501Because the regulator is designed to fit a specific valve body / cavityInner Diameter / Bore of RegulatorRemove the regulator insert (if accessible) and measure its inner opening or orifice diameterTo match the flow restriction and allow correct replacementOuter Dimensions / Housing FitMeasure outer diameter and length so the regulator fits snugly in the valve bodyTo ensure the insert seats correctly and is sealedThread / Seat InterfaceNote how the regulator is fixed (screw‐in, press‐fit, snap ring, gasket seat)Replacement must interface similarlyFlow / Restriction RatingIf known (e.g. in L/min or GPM), or by observing how much it restricts flowTo maintain the intended performance (not over‐restricting)Material / Mesh / Orifice TypeInspect if the regulator is metallic (brass / stainless) or plastic, and whether it uses mesh / perforated plate / orifice discTo ensure compatibility and durabilityWater Pressure / Line ConditionsKnow the line pressure and conditions (e.g. supply pressure, fluctuations, water quality)To ensure the regulator is suitable (not too restrictive, not damaged easily)
Once you have these measurements, you can source a matching flow regulator insert or have a custom one made.
Possible Replacement / Compatible Options
While not specific to TT6501, here are some general approaches and product types you might find useful:
- Check TOTO’s own flow regulators / inserts (used in faucets, sensor systems) — some of these may match in size, especially if the stop valve part is from the same product line.
- Use a universal flow regulator insert that matches your measured bore and seat interface.
- Ask TOTO spare parts / service center with the TT6501 code + your valve model to see if they can issue the specific insert as spare.
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