Acts as a manual thermostat, allowing you to by-pass the oil cooling system for cold-weather riding or for faster warm-ups on cool days Durable anodized billet aluminum construction Knurled grip knob Works with all oil coolers Compact in-line installation Service kit contains replacement o-rings, snap-ring retaining clip for manual bypass valves knob and spare decal If oil hoses between the oil cooler and the oil source are too short, the oil cooler bypass valve may not fit in the oil lines; Jagg bypass valves require at least 3" of straight hose.. VALVE BYPASS MANUAL