Product Item: ASTM A216 WCB Check Valve
Standard: API 6D
Material: ASTM A216 WCB
Size: 6 Inch
Pressure Rating: Class 300 LB
End Type: Flanged End
Finish: Silver Grey

Source: https://www.landee.cn/astm-a216-wcb-check-valves-api-6d-6-inch-300-lb-flanged.html