Replace missing or broken timer trippers: Pool timer on/off clips are exclusively designed to be compatible with Intermatic 156T1978A timers; These pool timer replacements are made of upgraded materials that are not prone to corrosion and rust Longer fastening screws: Compared to other screw styles, we have designed longer screw styles, which are easier to install and the release does not allow loosening; Compared to replacing the entire timer, you can save maintenance and repair times by using the replacement trippers to replace the tripper Compatible 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 purchasing Easy configuration: Simple configuration compatible with the T100 series and time clocks requires only 1 silver ON tripper and 1 gold OFF tripper; Just take out the screw on the pool timer tripper, then place the pool pump timer tripper in the desired position on the time switch dial and finally screw it on; Hassle-free installation for efficient time switch function Complete tripper kit: Our time switch tripper kit compatible with Intermatic 156T1978A includes 5 gold, 5 silver and 10 fastening screws; By using the replacement tripper kit, you can adjust the timer's on and off times precisely; If any problems occur, please contact us, we are always here