Aquastat Controller, High or Low Limit, 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, 100-240 Degree Operating Temperature Range, 5 Degree Fixed Differential Temperature, 3/4" Well Spud Size, Factory Stop Set at 160 Degrees