The Autotrol 255-764 is a pair of duplex meter-controlled valve heads used on twin-tank water softener systems, where one tank remains in service supplying soft water while the other regenerates, giving continuous soft water with no interruption. Stocked by WrekinWater, this is a full replacement for both control heads on a commercial or high-demand duplex softener, matched electronically so the two valves alternate correctly based on metered water usage. This is the part to order when one or both control heads on an existing duplex system have failed beyond economical repair.
Technical specifications
| OEM Part Number | 255-764 |
| Configuration | Duplex (twin) meter-controlled valve heads |
| Control Type | Logix meter-controlled regeneration, alternating operation |
| Includes | Two control valve assemblies, matched for duplex alternation |
| Excludes | Top screen/display bezel (sold separately) |
| Compatible With | Autotrol 255-series duplex twin-tank softener systems |
| Typical Application | Commercial and high-demand installations requiring continuous soft water |
| Brand | Autotrol |
Symptoms that mean you need this part
- One or both valve heads have stopped alternating correctly, leaving the system without continuous soft water
- A control head has failed electronically or mechanically and matched duplex spares are no longer available
- The system has needed repeated repairs on one or both heads and full replacement is now more economical than further individual fixes
- You're replacing an obsolete or discontinued duplex control set and need a matched pair for correct alternation
Why it fails / why it matters
A duplex softener relies on its two control heads communicating so that one tank stays in service while the other regenerates, then swaps over, guaranteeing an uninterrupted supply of soft water even during regeneration. If one head's electronics, turbine or valve body degrades, the alternation logic can be thrown out, leaving the system running on a single tank, missing regenerations, or losing soft water cover altogether during changeover. Because the two heads are matched as a pair, replacing them together as the 255-764 set is the reliable way to restore correct duplex operation rather than mixing an old head with a new one.
Why buy this from WrekinWater
WrekinWater has supplied Autotrol and Pentair Fleck valves to commercial installers and engineers for over 15 years from its Bettisfield, Shropshire base, and as a stockist of the full Pentair Fleck, Autotrol, Clack and Kinetico ranges can advise on compatibility for duplex commercial systems specifically. With more than 50,000 customers served and an Excellent Trustpilot rating, WrekinWater is a dependable source for a part where continuous soft water supply is business-critical.
How to fit it
- Confirm the 255-764 duplex pair matches your existing twin-tank system, bypass configuration and manifold before ordering
- Have a commercial water treatment engineer isolate the system and take one tank out of service at a time to maintain supply where possible
- Disconnect the failed valve head(s) from the bypass, riser tube, drain and brine lines
- Fit the new duplex valve heads, aligning the riser tubes correctly on each tank
- Reconnect bypass, drain and brine lines, wire in the electronics, and programme the alternation, capacity and hardness settings so both heads communicate correctly
- Restore supply, check all connections for leaks, and run a full test cycle to confirm the two heads alternate and hand over service correctly
Frequently Asked Questions
Unfortunately we are unable to accept returns on our Water Softener Parts So please confirm the correct part is ordered. If you have any doubt please feel free to call us prior to purchase for confirmation.
Autotrol 255-764 Duplex Meter Controlled Valve Heads
