Model "BR" Back Pressure Regulator, Revision A, For General Service; 2" Line Size, Globe Style; Stainless Steel Body And Spring Chamber; SK Trim: 316 Stainless Steel With Fluorocarbon Elastomer (FKM) Seat And Diaphragm; NPT Threaded End Connections; 2-10 PSIG Range Spring; Polyethylene Vented Spring Chamber Plug