... -4SMø2413.5211/2"NPT INTERCHANGEABILITY: Parker 20 series,Rcctus 23KA series,Amflo type "D" series,CEJN 310seriesAPPLICATION: Pneumatic tools, Automotive,Compressed,Air,Machinery ... positive gripping-Proven and positive connection suing ball-loking mechanismConstruction:-Socket body: brass,steel,stainless steel-Backnut: brass,steel,stainless steel ...