A ring joint flange is a type of flange that uses a metal ring to create a leak-proof seal between two pipes. The metal ring is placed in a groove on the face of the flange and is compressed when the bolts are tightened. This compression creates a tight seal that prevents the flow of fluids or gases between the pipes. Material: Carbon Steel, stainless steel, nickel alloy Size: 1" to 24" Pressure rating: 150# to 2500# Class: ANSI Class 150, 300, 600, 900, 1500, 2500 Standard: ANSI B16.5, API 6A, DIN EN 1092-1 Ring joint flanges are a reliable and effective way to create a leak-proof seal. They are used in a variety of applications where a high level of safety and reliability is required.