? The Heavy Duty Series is an excellent solution for applications where higher air flow is the primary concern. Top level performance and long lasting durability is assured by such features as an extra large bronze filter element, critically close air regulation, mist-type lubricant atomization, and a rugged die cast aluminum body. ? Collect moisture accumulated from compressor tanks, filters, drop legs, after coolers, dryers and other devices and di charges it. ? Contains a manual override feature, through use of a petcock, to permit draining between automatic drain times