... " 3.Rating:class 150-1500lb Class 150-1500 Swing Check ValveDetailed Product Description:Class 150~1500 Swing Check ValveBolted cover, swing type ... : ANSIB16.34, API6D, BS11868Face to face(end to end): ANSIB16.10,API6DFlanged connection: 2"~24"to ANSIB16.5,22",26"~36 ... welded end: ANSIB16.25Test and inspection: API598, API6D Class 150-1500 Swing Check Valve