The Jagg Automatic By-Pass Valve acts as an automatic thermostat allowing you to by-pass the oil cooler for cold weather riding or faster warm ups on cool days. Durable anodized billet aluminum construction and compact in-line installation. Works with all oil coolers but if the oil hoses between the oil cooler and the oil source are too short, the oil cooler by-pass valve may not fit in the oil lines. Jagg mini by-pass valves require at least 3 inches of straight hose. The Jagg Automatic By-Pass is supplied complete with all necessary hardware and easy to follow installation instructions.