Wilfley has maintained leadership in "seal-less pumping" since patenting the first sealless pump in 1920. In many applications it is beneficial to be able to operate without braided packing, without a mechanical seal and without flush water. Wilfley offers centrifugal pumps with dynamic sealing for abrasive and corrosive applications. Wilfley Model A Series pumps meet ASME specifications and they and other Model Series are available in a variety of materials and configurations. Wilfley maintains its' own foundry and offers alloys including proprietary hard irons developed for long life in applications that are corrosive and abrasive.