These ASTM A182 F316L Slip-On Flanges are precision-engineered factory components designed for low-pressure piping systems. Manufactured from low-carbon stainless steel for superior corrosion resistance and weldability, each 3-inch (DN80) SO flange features a raised face and strictly conforms to ANSI B16.5 standards. Rated for Class 150 LB / PN20, these flanges are ideal for quick and easy installation, simply sliding over the pipe before fillet welding both inside and out to provide a strong, leak-proof connection.