Intermatic 156T1948A Extra/Replacement Trippers for T170/P171/T1400/T1800 Series Mechanical Timers 1 "on", 1 "off" and 1 "skip-a-day off" trippers included For use as extra set points or replacement Metal construction Built-in screw for mounting on timer Designed for use with the T170/P171/T1400/T1800 series mechanical timers Warranty : 1-year