Making repair possible - so replacement isn't your only option!
Water Closet Diaphragm Assembly Kit
What is this? This is a pre-assembled "drop-in" repair kit designed to replace the primary internal moving parts of commercial toilet flushometers. It is specifically engineered for valves rated at 1.6 gallons per flush (GPF), also known as low-consumption models.
What does it do?
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Solves Common Failures: This kit is the standard solution for the most frequent flush valve issues. If your toilet won't shut off, has a weak flush, or is leaking internally, replacing this assembly restores the valve to factory-new performance.
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Maintains Precise Metering: The integrated brass bypass and natural rubber diaphragm work together to regulate water pressure and volume. This ensures a consistent 1.6-gallon flush every time, preventing water waste and ensuring the bowl is cleared properly.
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Ensures Quiet Operation: By replacing worn, stiff, or mineral-encrusted internals with fresh components, it eliminates the whistling or "chattering" sounds often associated with aging valves.
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Commercial-Grade Durability: Built with a natural rubber diaphragm and a durable relief valve, this kit is designed to withstand the high-frequency use typical of public and commercial restrooms.
Will it fit my needs? This kit is compatible with manual diaphragm flushometers used on toilets. It is specifically designed for the Regal series. If you are maintaining a high-traffic facility and need a reliable, quick-to-install repair for a 1.6 GPF toilet, this OEM assembly is the recommended choice.
What comes in the box?
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Natural Rubber Diaphragm
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Relief Valve
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Molded Disc
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Guide Assembly
| Feature | Details |
| Part Number | 4188 |
| Item Type | Diaphragm Repair Kit |
| Flush Volume | 1.6 GPF |
| Material | Natural Rubber / Brass / Plastic |
| Application | Closet Flushometers (Toilets) |
| Compatibility | Regal Series Manual Valves |
| Design | Drop-In Assembly |