Use these tripper pins to replace missing pins or add extra set points to your mechanical time switch. The pins fit all intermatic T100 series time switches, as well as the WH40 electric water heater time switch. 1 On and 1 Off tripperUsed with all T100 series time switches and mechanismsMade of metalFor model numbers T101, T102, T103, T104, T103-30, and T104-20Silver and brass