This is a Replacement Electronic Coolant Valve Kit RV218999 for Evans Tempcon. This kit comes with the valve, wire harness, and screws.
Evans Units: RV2218999, Replaces RV218812 and others with 3 pins on top and 1 in the center on the bottom.
Picture posted is where your old pigtail plugs into.
Possible Compatible Motorhomes: Airstream, Beaver, Damon, Safari, Eldorado, Monaco, Thor, Tiffin, Winnebago Motorhomes, and many more.