FOR SALE HERE ARE STANDARD INTERMATIC TIMECLOCK REPLACEMENT TRIPPERS, THEY FIT 98% OF TIMECLOCKS MADE BY INTERMATIC MANY MADE BY DAYTON !! ? 2 On and 2 Off Switch ? For Model No.'s T101, T102, T103, T104, T102-20 and T104-20 ? UL and CSA listed Intermatic Timer Trippers are used in conjunction with Intermatic Timers in the following series: WH, T100, T101, T102, T102-20, T103, T104, T104-20, T170. The 156T1978A Timer trippers are placed on the timing wheels of certain Intermatic timers to control the timing cycle. In these pairs, the silver the green tripper activates the timing cycle and the gold trippers will shut the cycle off. The 156T1978A Timer Trippers were previously known as the 156T1961A Timer Trippers and may still be labeled or sold as such.