Replace Missing or Broken Timer Tripper: : pool timer on off clips are exclusively designed for compatible with Intermatic 156T1978A timers; These pool timer replacements are made of upgraded materials that are not prone to corrosion and rustLonger Fixing Screws: : Compared with other styles of screws, we have designed longer screw styles, which are easier to install and the release does not allow loosening; Compared with replacing the entire timer, using the replacement trippers to replace the tripper can save maintenance and repair timesCompatible with Intermatic T100 Series and Time Clocks: : Compatible with 1A219, 1A220, 1A573, 1A850, 2A208, 2A209, 2EO21, 2EO23, 2EO22, 2E214, 2EO25, 2E25, 3E25, 35E3, 4EO24, 4EO26, 4EO25, 6X757, 6X759, 6X760, 6X768, 6X767 and 6X769. T101, T102, T103, T104 and 102-20, 104-20, T101R, T101M, T104M, T104R; Please confirm the model number before purchasingEasy Configuration: : Simple configuration is compatible with T100 Series and time clocks only requires 1 silver ON tripper and 1 gold OFF tripper; Just take out the screw of the pool timer tripper, then place the pool pump timer tripper in the desired position on the dial of time switch, and finally screw it on; Hassle free setup for efficient time switch operationComplete Tripper Kit: : Our time switch tripper kit compatible with Intermatic 156T1978A includes 5 gold, 5 silver and 10 fixing screws; By using the replacement trippers kit, you can precisely adjust the timer's on and off times; If any issues, please kindly us, we are always here