Main Properties and Applications: The product is manufactured according to American Petroleum Institute Standard API-SPEC16A-1998. The quality is bearing pressure cast steel, with high strength and good toughness, and with excellent welding performance as well. The working environment temperature of the product is -59 ℃ ~ 121 ℃, and the test pressure is up to 105N/ mm2. It is an important matching equipment used in oil and gas industry.