• 104-230'F digital adjustable electric fan thermostat switch wiring kit.
• 1/8" inch NPT thread-in brass temperature sensor threads into port.
• 50mm hose adapter is sized based on the outside diameter of neck.
• 40 amp relay harness with 14AWG wire powers up to 2 electric fans.
  
• This fan switch kit is compatible with either 12 or 24 volt applications.
• Maximum 30 amp continuous draw with 30 amp in-line fuse per fan.
• A/C override or manual toggle switch wire built directly into harness.
• Optional second fan starts 10 seconds after first fan begins cooling.
• Fan(s) will auto shut-off at 10 degrees under your set turn-on temp.

Other size hose adapters can be found in this eBay listing.