10 Best Toilet Fill Valves 2025 in the United States

The Fluidmaster 400H-5003 Performax Universal Toilet Fill Valve 2-pack is designed to fit most toilet models, making it a versatile choice for many households. Its universal fit and EZ-Twist height adjustment (from 9 to 14 inches) help it accommodate a wide range of tanks, which means fewer compatibility worries. The valve offers tank and bowl water level dials, allowing you to customize the flush for better performance and water savings.

This model is praised for being one of the quietest and most powerful fill valves, providing a faster refill and stronger flush compared to standard valves. Installation is straightforward thanks to clear, step-by-step instructions, making it suitable even for DIY beginners. The durable plastic construction backed by a 7-year limited warranty adds confidence in its long-term reliability. While the valve is generally quiet, some users might notice minor noise depending on their water pressure or toilet type.

Being made of plastic rather than metal might be a drawback for those seeking maximum durability over many years. Taking into account the price and ease of use, the Fluidmaster 400H-5003 offers a solid balance of performance, quiet operation, and adjustability, making it a strong option for anyone needing to replace or upgrade their toilet fill valve.

The Toto THU134 Fill Valve Assembly is designed for use with in-wall tank systems, specifically the WT151M or WT152M models. Its compatibility with these specific systems ensures it will fit well if you have one of these models, though it may not be suitable for other toilet configurations, limiting its versatility. The brass construction of the valve suggests good durability, as brass is known for its corrosion resistance and longevity. This can be a significant advantage in maintaining the functionality of your toilet over time.

Ease of installation is noted as being wall-mounted, which could be straightforward if you’re replacing a similar unit. However, if you’re not experienced with plumbing, installing an in-wall system can be more challenging compared to standard, exposed tank systems. The product dimensions and weight (10 x 3 x 6 inches, 4.8 ounces) make it relatively compact and lightweight, which should aid in the installation process.

In summary, the Toto THU134 appears to be a durable fill valve for specific in-wall tank systems, but its limited compatibility, unclear adjustability, and noise level should be considered.

The TOTO TSU99A.XR Fill Valve is an adjustable fill valve designed to work with all TOTO toilet tanks, which makes it highly compatible across the brand. The adjustability ensures that it can reset your tank back to optimal performance, which is a great advantage. The package includes everything you need for installation – the valve, refill tube and clamp, cone washer, and nut, which simplifies the process.

At 10 inches in height, the dimension is fairly standard and should fit most tanks comfortably. The valve uses a standard 7/8 inch inlet connection, which is common and should make finding compatible parts easier if needed. Made from durable materials like stainless steel and brass, this fill valve is designed for longevity, adding to its durability.

While the product doesn’t highlight its noise level, it’s worth noting that noise can sometimes be an issue with fill valves, so if noise reduction is a priority, you might want to investigate further. Additionally, the valve is relatively lightweight at 9.1 ounces, which should make the installation process easier. The fill valve’s high ranking in the Toilet Flush Valves category suggests it is a popular and reliable choice. This valve seems like a good fit for someone looking for a reliable and easy-to-install option specifically for TOTO toilet tanks.