Belt Guard Aftercooler for 15 Horse Power Motor 1 Inch Female NPT Fittings Black Compressed air can reach temperatures of several hundred degrees, so it's often times important to have an air cooler in your system. This aftercooler can mount directly to your existing belt guard. The intake and output are both 1 Inch Female NPT fittings. This cooler is designed for 15 HP motors. The dimensions between the bolt mounts are 19.75 x 11.5 Inches. Please see below for more details and specifications. Features & Specifications: 1 Inch Female NPT Fittings Can Mount Directly To Your Existing Belt Guard Dissipates Heat To cool Hot Air For 15 HP Motors Dimensions Between Bolt Mounts: 19.75 x 11.5 Inches