Raceworks Branded LS Engine Coolant Temp Port Adapter / Reducer - M12 x 1.5 to 1/8 NPT
Allows the spare water port at the rear of the drivers side head to be adapter from the uncommon M12x1.5 Thread to a common 1/8 NPT Thread. Perfect for aftermarket gauges or LS conversions where you're trying to get the factory dash working.
Also required when using our VN-VS Plug in LS Harness