The Autotrol 1265 bypass valve fits the Autotrol Performa ( 263 & 268 ), Technetic 1100 (not older models), Avanta Pure, and 168 control valves.
Bypass is called the 1265 ( part # 1040930 ).
Note: This does not work with older Autotrol 163, 168, 155 or 255 valves. Nuts should only be hand tightened, overtightening will cause the nut to crack and is not covered under warranty.