Model 345 Rev B Pressure Reducing Regulator; 1/2" Line Size; Stainless Steel Body With Bronze Spring Chamber; S3E Trim: 316 Stainless Steel With PTFE Seat, EPDM O-Rings, Graphite/NBR Cylinder Gasket; NPT End Connections; 125-250 PSIG Range Spring; Special Rating To -55°F