If the nipple is in the middle of the intake there is a cap that goes over the nipple. THIS MUST BE CAPPED. The nipple is not connected to any hose. Use Evinrude for your parts lookup and your shop manual for your hose routing. There are plenty of online parts stores that sell the parts. The air box has a nipple on the bottom for one hose and there is another hole on the top of the airbox for the other hose.