Class 150 Steel Slip-On Plate Flanges (Series PF) are meet AWWA C207-13 and ANSI #150 bolt pattern specifications. This flange type can be manufactured in additional grades of steel, if necessary. Notes:a. Flange material is steel (to AWWA C207-13 specifications). Specific grades of steel for structural or critical applications are available upon request.b. Meets ANSI class 150 pattern.