INS-FLTR03 Inline Coolant Filter All metal inline coolant filter for keeping accidental debris from damaging the pump or clogging other components. It includes two reusable stainless steel filters with hole sizes of 0.42mm/sq and 0.27mm/sq. G 1/4 BSPP sockets are provided on both sides, with one male and one female for easy installation into the inlet of a water block, pump, or heat exchanger. Nickel-plated brass and stainless steel mesh filters. The filter body can be unscrewed for cleaning or replacement.