38mm/1.50in Toilet Push Button Thread Diameter, Dual Push Flushing Toilet Water Tank Button

38mm (1.50") Dual Flush Toilet Water Tank Push Button

Key Features

• Dual-Flush Efficiency: Features a split-button design that allows for both a partial flush (liquid waste) and a full flush (solid waste), helping to significantly reduce household water consumption.
• High-Quality ABS Construction: Manufactured from premium, impact-resistant ABS plastic that withstands the constant humidity and chemical exposure found inside a toilet tank without corroding or becoming brittle.
• Reflective Chrome Finish: Equipped with a multi-layer electroplated chrome surface that resists scratches and tarnishing, maintaining a clean, modern aesthetic that matches standard bathroom fixtures.
• Adjustable Actuator Rods: Includes two threaded plastic rods that can be trimmed or adjusted in length to perfectly match the height of your specific flush valve, ensuring a precise and responsive flush.
• Precision 38mm Threading: Engineered with a standardized 38mm (1.50 inch) outer thread diameter, providing a snug, leak-free fit for the most common toilet tank lid openings.

Replaces / Cross-Reference Part Numbers

• Thread Diameter: 38mm / 1.50 inches.
• Button Outer Diameter: Approx. 48mm–50mm (to cover the lid hole).
• Rod Length: Typically 100mm–105mm (Adjustable/Trimmable).
• Material: Engineering Grade ABS Plastic & Stainless Steel Spring.
• Style: Circular Top-Mount Dual Flush.

Compatibility & Fitment

This button is designed as a universal replacement for top-mount flushing systems. Key compatible brands include:

• Popular Retail Brands: Fits most modern Glacier Bay and AquaSource dual-flush models.
• Premium Manufacturers: Compatible with specific top-mount models from TOTO, Kohler, and American Standard.
• European Standards: Direct fit for many Geberit, Twyford, and Ideal Standard cisterns utilizing the 38mm hole standard.
• Note (CRITICAL): This button fits a tank hole diameter between 38mm and 45mm. Please measure the hole in your toilet lid before ordering to ensure the thread diameter is correct.

When to Replace

• Button Becomes Stuck: The button stays depressed after flushing, causing the water to run continuously into the bowl.
• Broken Actuator Rods: The internal plastic rods have snapped or stripped, preventing the button from reaching the flush valve.
• Peeling Chrome: The decorative finish is bubbling or flaking off, which can be sharp to the touch and affects the bathroom's appearance.
• Loss of "Springiness": The internal stainless steel spring has weakened, making the button feel "mushy" or unresponsive.
• Full Flush Only: The partial flush mechanism has failed, forcing you to use a full tank of water for every flush.

Installation Tips

• Safety First: Turn off the water supply to the toilet and flush once to empty the tank. This makes it easier to work without water splashing.
• Measure Twice (PRO TIP): Before installing, place the button in the lid and hold it over the flush valve to determine the required rod length. Rods that are too long will cause the toilet to run; rods that are too short won't trigger the flush.
• Trimming the Rods: If the rods are too long, use a pair of pliers or a hacksaw to trim them in small increments. It is better to cut them slightly long and fine-tune the adjustment by threading them in or out.
• Hand Tighten Only: Screw the mounting nut onto the button threads from the underside of the lid by hand. Overtightening with a wrench can crack the ceramic toilet lid.
• Test the Flush: Once installed, replace the lid and test both buttons. Ensure there is a small "gap" (1–2mm) between the rod and the valve when the button is at rest to ensure the valve seats fully.