Intermatic 156T1978A Time Switch Trippers for T100 Series Timers 2 On 2 Off With 4 . Best Sellers Rank, #902 in Tools & Home Improvement (See top 100). Best Sellers in Pool Timers. 1. Intermatic 156T1978A On & Off Intermatic Time Switch Trippers Replacement. Intermatic 156T1978A On & Off Intermatic Time… Intermatic 156T1978A Time Switch Trippers for T100 Series Timers: Intermatic Timer . Best Sellers Rank, #10,411 in Tools & Home Improvement (See top 100) Did you lose something? Use these tripper pins to replace missing pins or add extra set points to your mechanical time switch. The pins fit all Intermatic T100 . Intermatic Timer Mechanisms and Timer Trippers . Intermatic PF1102T Single Time Clock with Freeze Guard w/ Mechanical Clock 240V perfect-rating.png . Dec 14, 2015 - Maintaining a healthy swimming pool is hard work. . The Intermatic T101 Series timer is perfect for this task. . 24 hour time switch; Equipped with one ON and one OFF tripper, but can accommodate up to 12 different ON/OFF. Compare prices & save money on Swimming Pools & Spas. . Intermatic Pool & Spa PB800 / PB900 Time Clock Timer Trippers 156PB10398A, Intermatic Pool . Results 1 - 48 of 521 - 220 Volt Intermatic Mechanical Timer for Swimming Pool or Spa Pumps 156T1978A Intermatic 1 ON 1 OFF Pool Time Clock Trippers. When your pool timer stops working, it doesn't necessarily mean that you will have to rush out and buy a new one. There are several reasons why your pool .