Leslie Diaphragm Stop Valve 16606N DONSX 1IN 3B25A2NL SIZE 1" TRIM SIZE 1/2" TRIM MATERIAL18-8STELL CLASS DONSX CODE 3B25A2NL RATING 150/500 TEMP MAX BODY MATL WCB INNER VALVE EPCN SERIAL NO. 12308-1AII NORMALLY OPEN MAX AIR 60PSI MEDIA FOR WHICH DESIGNED STEAM 1ST RESPONSE STEAM 2ND RESPONSE CONNECTION TYPE UNTHREADED INTERNAL PIPE ALL ENDS MANUFACTURERS CODE 35795 DESIGN CONTROL REFERENCE DONSX 1IN3B25A2NLCD27833N MIL-V-18030 .To read more visit http://www.lesliecontrols.com/Products/LinearControl/gtb.htm Leslie Controls, Inc.