Camshaft used for Autotrol 155 & 255 water softener control valves.
Newest part # 1031950, Standard One-Piece.
NOTE: Many older systems used a White Segmented Camshaft. This one-piece black is the replacement if your valve is used on a water softener.
It has the number 155C174 in small raised lettering on it.
Iron filter and Backwash only Camshafts are modified versions of this. Email for advice.