Mack bottom tank
This tank has a 2 1/2" diameter hose connection on the driver's side facing the engine, a 3/8" NPT flange on the bottom of the tank, and two keyhole type mounting brackets on the bottom of the tank. This tank comes with an oil cooler installed and can be ordered with either a 7 plate or 10 plate oil cooler with 3/4" NPT fittings spaced @ 18" center to center facing the engine. (718PC or 1018PC)
Note: tank #6619 is identical except without an oil cooler.