Fluidmaster 242 Toilet Fill Valve Seal Replacement - Fits 400A Fill Valve

Upgrade your toilet's reliability with the Fluidmaster 242 seal

Engineered to replace the seal in Fluidmaster 400A fill valves, the Fluidmaster 242 seal helps bring back a steady, quiet fill cycle. When the old seal wears, you may notice minor running sounds or a tank that won’t fill consistently. This replacement part is sized and shaped to align with the original design, offering a non-invasive way to refresh your toilet’s performance without a full valve swap.

Key benefits at a glance

• Compatibility: specifically designed to fit Fluidmaster 400A fill valves using the 242 configuration
• Ease of replacement: swap out the worn seal and refresh the valve’s sealing edge
• Durable construction: resilient rubber and precision molding support long-term sealing
• Potential water savings: a reliable seal may reduce minor drips and avoid waste between uses
• Quiet operation: a snug seal can contribute to a calmer bathroom by reducing running sounds

Real-life scenarios

In households with high water usage or frequent toilet use, a healthy seal helps maintain consistent fills. In rental properties or shared bathrooms, quick, non-disruptive maintenance routines can minimize downtime and keep toilets functioning smoothly.

Installation tips for best results

• Turn off the water supply and flush to empty the tank before you start
• Carefully remove the old seal and inspect the valve for any wear on neighboring components
• Align the new 242 seal with the valve’s seating edge and reseat evenly
• Reconnect the supply line, turn on water, and test for leaks with the tank at rest and in cycle

Note: Real-world results depend on proper alignment and water pressure. The 242 seal offers a practical, non-invasive way to refresh a Fluidmaster 400A valve when needed.