Pentair Autotrol 255 Control Valve

The Pentair Autotrol 255 is a proven, direct-acting control valve at the heart of countless residential water softeners and filtration systems across the United States. Built on Pentair's long-standing Autotrol platform, the 255 valve manages the service, backwash, brine draw, and rinse cycles that keep softener resin or filter media working at peak performance. Its design operates independently of incoming water pressure, so it delivers consistent regeneration whether your home runs on a strong municipal supply or a more modest well pump. That pressure-independent operation is one of the main reasons installers reach for the 255 again and again, since it removes a common variable that can cause softeners to behave unpredictably from one home to the next. For homeowners battling hard water, scale, and the soap-wasting effects of high mineral content, a dependable control head is the difference between a softener that simply works and one that needs constant attention.

How It Works

Inside the rugged Noryl valve body, easy-access valve discs are held closed by water pressure rather than by fragile internal parts, which reduces wear and simplifies long-term service. The injector, injector screen, backwash, and brine controls are all reachable without specialty tools, and a simple locking bar lets you separate the valve from the mineral tank when maintenance is required. This combination of durability and serviceability is a big part of why the Autotrol 255 remains a favorite among installers and DIY homeowners alike. When a softener eventually needs cleaning or a worn part replaced, the accessible layout turns what could be a difficult job into a routine one, and the platform's wide aftermarket support means seals, injectors, and rebuild kits are readily available.

• Direct-acting valve operates independently of line pressure, pistons, and diaphragms
• Durable Noryl valve body engineered for years of dependable cycling
• Valve discs held closed by water pressure for reliable, low-wear sealing
• Accessible injector, injector screen, backwash, and brine controls
• Locking bar design for quick removal from the mineral tank
• Versatile platform suited to softener and filtration applications

Whether you are replacing an aging control head or building out a new treatment system, the Pentair Autotrol 255 offers a balance of simplicity, reliability, and easy maintenance that homeowners and water-treatment pros have trusted for decades. Pair it with the appropriate mineral tank, resin or filter media, and plumbing adapters to complete your installation.