Milton s-778 ARO style plugs are made of case hardened steel and plated to resist rust. A style plugs have a maximum pressure of 300 PSI and a basic flow size of 1/4". 

Technical Specifications

Product #	s-778
Type	A Style
Basic Flow Size	1/4" Basic Flow Size
Thread Size	1/4" FNPT
Air Flow	34 SCFM