Milton 1816 1/2″ NPT Male G-Style Coupler Brand new steel 1/2″ Male NPT Milton G-style air compressor quick coupler fitting. This is a top-quality quick coupler made in the USA and is constructed from steel so it will last longer than the cheaper couplers made from brass. Unlike others that only have 3 or 4 ball bearings to hold the plug end, this coupler has 8 ball bearings ensuring a long-lasting, snug, leak-free fit! This coupler has 1/2″ male NPT threads and it is only compatible with Milton’s G-Style 1/2″ body plugs. Please see below for more details and specifications.