Specialized Filters & Replacement Valves

Replacement control valves, filter heads, and repair parts for the systems we sell and support every day: Fleck (Pentair) 5600SXT, 2510SXT, 2510AIO, and 9100SXT control valves, and Clack C-Series upflow heads like the C1190. If the valve on your water softener, iron filter, carbon filter, or acid neutralizer has failed, a direct-fit replacement head is almost always far cheaper than a new system, and most swaps take under an hour with basic tools.

Which valve fits which system?

• Fleck 5600SXT: the most common residential water softener valve in America, also used on lighter-duty backwashing filters. If your softener has a small digital display on a compact head, this is probably it. See our Fleck 5600SXT owner's guide to confirm.
• Fleck 2510SXT: the heavier-duty digital valve used on larger backwashing filters (iron, carbon, backwashing acid neutralizers) and bigger softeners. The 2510AIO version adds air injection for iron and sulfur filters; the two are not interchangeable, so match the exact model on your head.
• Clack C-Series (C1190 / C1190FP): the upflow head used on non-backwashing acid neutralizers and carbon filters. No drain line, no electricity. Deciding between brands for a new system? Read Clack vs Fleck.

Check these three things before you buy

• Exact model. Match the model stamped on your valve body or printed on the control board (5600 mechanical vs 5600SXT digital vs 2510SXT). A digital SXT head and a mechanical timer head do not share pistons, boards, or repair kits.
• Tank and year. These valves fit standard 2.5 inch top-mount mineral tanks, which covers nearly every residential softener and filter built in the last few decades. If your system is much older or an unusual brand, send us a photo first.
• Media condition. Be honest about the bed inside the tank. Softener resin typically lasts 10 to 15 years, and filter media beds also wear out. A new valve on a fouled or exhausted bed gives you a working valve on a system that still will not treat your water. If your softener regenerates but the water stays hard, work through our softener troubleshooting guide and check the resin before assuming the valve is the problem. Our regeneration guide explains what the valve should be doing at each stage.

Often a repair kit beats a full valve

Leaks at the bypass, water running to the drain, or a hard-cycling valve are usually worn seals, spacers, or pistons, not a dead valve. The Fleck 5600 and 2510 rebuild kits and piston assemblies in this collection fix most of those for a fraction of the cost of a new head. A blank display on a working valve is usually just the control board.

Not sure which valve or part you need?

Send us a photo of your valve through our contact page or call and talk to a real water treatment expert. We will identify the head, confirm whether a swap or a rebuild kit fixes it, and tell you straight if the smarter move is replacing the system. If the system itself is at end of life, start with our water softeners, iron filters, and acid neutralizers.