• 22mm OD trans oil cooler hose adapter with 1/8" NPT port.
• 180'F turn-on electric cooling fan thermostat sensor switch.
• Circuit closes at turn-on and can power or ground your fan.
• Turn-off temperature is always 15 degrees less than turn-on.
• Mounts anywhere along your transmission oil cooler hose.
• Measures all fluid/liquid including water, coolant and oil.

Other sizes and temperatures can be found in this eBay listing.