Interconnecting Pipework for 255-764 Duplex Valve (1035640)

This interconnecting pipework, Autotrol part number 1035640, links the two valve heads on a 255-764 duplex control system, carrying water and pilot signals between them so one tank can stay in service while the other regenerates. WrekinWater supplies it as a genuine replacement for pipework that has cracked, perished, or begun weeping at its joints. As this is a specialist duplex part, please check current lead times with WrekinWater before ordering if you need it urgently.

Signs you need this part

• You can see weeping or dripping where the pipework joins between the two valve heads.
• The pipework has become brittle, cracked, or discoloured with age.
• One valve isn't handing over service correctly to the other tank.
• There's visible corrosion or scale build-up around the connection points.

In a duplex system, two valve heads alternate so that one tank is always in service while the other regenerates, and this interconnecting pipework is what carries treated water and pilot signals between them to make that handover work. If it splits or leaks, the changeover between tanks can leak water, lose pressure, or fail to switch over reliably, undermining the whole point of running a duplex setup.

WrekinWater is a family run water treatment specialist based in Bettisfield, Shropshire, with an Excellent Trustpilot rating and more than 50,000 customers served over 15 years, and stocks genuine Autotrol/Kennet duplex parts like this pipework.

How to fit it

1. Isolate the water supply to both valve heads and relieve pressure before starting.
2. Support the existing pipework and note how it connects to each valve head before removal.
3. Undo the fittings at each end and remove the old, damaged pipework.
4. Fit the new interconnecting pipework, using fresh seals or o-rings at each union.
5. Tighten each connection securely without overtightening the fittings.
6. Restore the water supply and check every joint carefully for leaks under pressure.