Product details:

Maradyne High Performance Fans MFA102: Electric Fan Controller, Thread-In, 185 Degrees On, 170 Degrees Off, 3/8 in.-18 NPT, Kit - Maradyne electric fan controllers are designed to operate a 12 V electric fan based on specific engine temperature. The controllers are available in fixed or adjustable temperature configurations, so you can choose what's is best for your cooling system.