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  4. 155 1550 TC
Autotrol 1550-TC is just the way many Autotrol Series 155 Timer Housings are labeled ( 440 timers ).
And normally the valve is Model 155.
This is the same design used for almost 30 years (replaced by the updated 255 Series in late 1996 ).
If you have any doubt - see: 

( Pictured with old style 36F air check )

Rebuilding the Autotrol 155 ( 1550-TC ) Valve Body


Old Style 440 Timer Assembly
Old Style 440i Timer Assembly
Old Style 460 Metered Timer Assembly

155 Valve Body
Old Style Air ( 36F ) Check
155 Valve Body
New Style Air Check
155 Piping Boss
Old Style 155 By Pass

Products [83]

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