Fleck 5800 Piston & Seal Kit, UpFlow Valve Part # 61838

The Fleck® brand by Pentair® is a global leader in residential and commercial water treatment control valves. Engineered for durability, precision, and long-term performance, Fleck control valves are trusted by water treatment professionals for water softeners, filtration systems, dealkalizers, and specialty water conditioning applications.

Known for their rugged construction and dependable mechanical and electronic designs, Fleck valves deliver consistent regeneration cycles, efficient water usage, and reliable system operation.

Pentair's Fleck product line includes a comprehensive range of industry-proven control valves such as the 2510, 2750, 2850, 2850s, 2900s, 3150, 3900, 4650, 5000, 5600, 5800 Series, 9000, 9100, and 9500 Series Valves, Accessories, Meters, and Controllers.

About Fleck® Water Treatment Valves

For decades, Fleck control valves have set the industry standard for serviceability and performance. Their modular design allows for straightforward maintenance and rebuilds, helping extend equipment life and minimize downtime. From the widely used 5600 and 2510 residential valves to heavy-duty commercial platforms like the 2850, 2900s, 3900, and 9500 Series, Fleck systems are built to handle a wide range of flow rates and water treatment demands.

If you are looking for a specific Fleck® valve, controller, meter, or replacement component not listed on this page, then please contact us by email or call our office (1-866-489-4004) for assistance. We supply genuine Pentair Fleck products and can help you identify compatible parts for your existing water softener or filtration system to ensure proper fit and performance.

Browse our full selection of Pentair Fleck control valves, repair kits, and accessories and get dependable water treatment components shipped FAST from our Canadian warehouse DIRECTLY to your door. A real Water Guy can help you select the right Fleck solution for your residential or commercial water system.