2 Pack, 3/8" NPT, Female, M Style, Plug, Case Hardened Steel Plated To Resist Rust, 1/4" Basic Flow Size, Offers Maximum Of 300 PSI, Air Flow Of 40 Standard CUFT Per Minute, Maximum Temperature Of 250 Degrees Fahrenheit, Milton M/I Style Kwik Change Couplers & Plugs Will Interchange With All Manufacturers Who Comply With The Dimensional Requirements Of Military Specification Mil-C-4109.