Honeywell Aquastat Controller, High Limit, Manual Reset, Immersion Device for Limiting or Regulating Temperature of Liquids, 3/8″ x 2 7/8″ Copper Bulb, SPST Contacts Break on Temperature Rise, Horizontal or Vertical Mounting, 130-270 Degree Operating Temperature Range, 3″ Capillary Length, Factory Stop Set at 250 Degree, Includes Well Adaptor and Heat Conductive Compound