Amazon.com: Coolant Filtration Filter Kit For 03-07 Super Duty Ford 6.0 6.0L Powerstroke Diesel : Automotive
Coolant Filter & Inspection System | Vehicle Enhancement Labs
Coolant Filtration | Hennig
Customer didn't think the stock coolant filter was sufficient so they added their own. It's filtering coolant entering the heater core. : r/Justrolledintotheshop