Inline Engine Coolant Heater with Pump — Titan-P4 for Large Trucks and Heavy EquipmentIf you've got a semi truck, large diesel, or industrial generator that a tight 90 block heater can't fit cleanly into, the Titan P4 is built for you. Its 180 straight through ports let coolant flow inline through your entire engine no choke points, no flow loss, and easier to install on long hose runs. 180 Straight Through Inline Design Inlet and outlet sit on opposite ends, so your coolant flows in a straight path through the heater. Less flow