The Fluidmaster 400AC Ballcock (FM400AC) is one of the most widely recognized and trusted toilet fill valves on the market. Designed to replace older ballcock-style fill valves, the 400AC uses Fluidmaster’s proven float cup design to deliver quiet, efficient, and reliable toilet refilling performance. Millions of households and professional plumbers rely on this valve because of its versatility, durability, and ease of installation.
Unlike outdated fill valves that use a long float arm and ball, the Fluidmaster 400AC features a compact, modern mechanism with a float cup that rises and falls with the water level. This streamlined design reduces noise, improves accuracy in shutting off the water supply, and allows for quick adjustment of tank water levels. The 400AC’s adjustability makes it universally compatible with most toilet brands and models, fitting tank heights between 9” and 14”.
Another standout feature is the anti-siphon protection, which prevents contaminated water from flowing back into your home’s clean water supply. This meets critical plumbing code requirements while ensuring the safety of your household.
Installation is simple and requires only basic tools. Whether you’re a professional contractor or a DIY homeowner, replacing an old or failing fill valve with the 400AC typically takes less than 10 minutes. The included refill tube and easy-to-follow instructions make the process even more straightforward.
The 400AC is built from corrosion-resistant materials that hold up against years of constant water exposure inside the toilet tank. Its dependable design has made it the industry standard for decades, often chosen as the factory-installed valve by leading toilet manufacturers.
Maintenance and fine-tuning are also simple. With an adjustable roller clamp, you can fine-tune the water level to improve flush performance and optimize water efficiency. Replacement parts are widely available, extending the product’s service life even further.
The Fluidmaster 400AC Ballcock FM400AC is the perfect solution if your toilet is running, noisy, or failing to refill properly. It combines reliability, universal compatibility, quiet performance, and easy installation, making it one of the best toilet repair parts available today.
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