Technetic 1000 and Plus 1000i - used Series 1010 Bypass Valve.
And many have / will become cracked and start leaking.
The By Pass ( 1010 ) is obsolete, and no longer available from any known source ( has not been for several years ).
Newer models use the 1265 By Pass ( large threaded Nut connection to valve body ),
This only works as replacement of exact same design.
Spacing does not match older Valve Bodies.
By Pass 1265 for Performa and newer Technetic Valves
Remove By Pass, and then you can screw the Adapter Nuts directly to the Threads on the Valve Body.
You will find / see these threads on the actual Valve Body, once you remove the defective By Pass.
You can continue to use your Technetic control head, only now without having the manufacturer's By Pass valve.
Below is photo of the Obsolete 1010 By Pass
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