Adjust your oil pressure easily with the Pro-Just pressure relief cap. Made from billet 6061 aluminum and are counter bored to accept two o-rings. Kit comes with blue super pump spring ONLY. Adjustment of the oil pressure is done with the engine running. Turning thumb screw clockwise increases oil pressure, while turning counter-clockwise decreases oil pressure. Oil Pump Spring 1 & Relief Cap Kit. Fits Big Twin Single Cam 1973/1999. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle & Scooter Parts & Accessories\Engines & Engine Parts\Oil Pumps & Parts". The seller is "show2gocustoms" and is located in this country: US.