MS4-LFR-1/4-D7-EUV-AS Filter Regulator Unit The Festo MS4-LFR-1/4-D7-EUV-AS Filter Regulator Unit is designed with precision and expertise to enhance the performance of your industrial machinery. With a 1/4 inch port size and a flow rate of 1500 l/min, this unit ensures efficient filtration and regulation for your pneumatic systems. Its sturdy construction and advanced technology make it a reliable and long-lasting choice for your filtration needs.