Mechanical leather configurations include back-up washers, flanges, cups, U-and V-packings, and increase life cycle of pump. Leather is impregnated with greases, oils, waxes, or rubber to enhance lubricity and sealability. Packings operate in temperatures from 30° to 150° F.C.W. Marsch Co.,(231) 722-3781, www.cwmarsh.com