PosiTech® International manufactures and distributes marine engine and charge air aftercoolers for Caterpillar and Detroit Diesel engines. Our marine coolers are designed for both fresh water and sea water applications. Applications include 3208, D379, D398 and D399 Caterpillar engines, along with 8V-92 and 12V-71 T.I. Detroit engines. We have the most extensive on-shelf availability and our rigorous quality control standards allow you to benefit from OEM quality at aftermarket price levels.