The NL4 series is Aventics' mid-flow air preparation module — filters, regulators, lubricators, and integrated FRL assemblies sized for higher flow than the NL2 with G1/4, G3/8, and G1/2 port options. Configurable filter ratings, full pressure ranges, manual or automatic drains, and bowl options span typical industrial requirements. The NL4 platform is the workhorse FRL choice for general-purpose machine air conditioning across packaging, process, and assembly automation.