The Kuryakyn 9930 Long Leg Bluegrass Breather Kit features banjo fittings and chrome tubes that route the vented gasses upward so gravity can keep any expelled oil droplets in the engine. It is recommended to vent the crankcase in open air by running the vent line up and out of sight beneath the tank. Helps in venting expelled oil from the cylinder heads. Includes (2) Chrome Banjo Elbow Long Assembly, (1) Bluegrass Breather Hardware Kit. The Kuryakyn 9930 Long Leg Bluegrass Breather Kit is compatible with Harley-Davidson models: 93-99 Evo Big Twin with Mikuni HSR series carb, 91-19 XL.