IMH 558 LC Series Pressure Relief Valves are 5.5 mm diameter threadless, cartridge-style valves that offer higher flow capacity. The 558 LC Series offers more than a 67% increase in flow capacity over our standard 558 series forward flow relief valve product line. These valves also utilize The Lee Company’s field-proven insert principle that provides secure retention without the need for threads, O-rings or sealants and are designed for installation into metal manifolds. The valves are all stainless steel construction with a high-quality metal to metal seat providing low leakage and long life. The valves guided ball design ensures fast response, low hysteresis and highly repeatable cracking pressures.