AWWA Class E Steel Hub Flanges (Series PF-E-H) are manufactured to AWWA C207 and ANSI #150 drill pattern specifications. At atmospheric temperature, this flange is pressure rated to 275psi. Notes:a. Steel material conforms to the requirements of AWWA C207 specifications. Other material is available upon request.b. Meets ANSI class 150 pattern. Pressure Ratings: 275psi at atmospheric temperature. .pf-button.pf-button-excerpt { display: none; }