Delavan 8900C Cast Iron 8-roller pump. 1 inch NPT Ports, 15/16 inch Solid Shaft. 1000 RPM Max.Removable end plate enables field servicing. Replace rollers on the spot. Ultra Rollers are standard for improved performance, longer life and smoother operation. Glass-filled polypropylene rollers are optional.Heavy-Duty Stainless Steel rotor with an overcoat of high performance composite increases efficiency and pump life. Stainless Steel shaft assembly with an extra-fine finish minimizes seal wear.Viton seal rings provide a positive seal between the end plate and pump body. Heavy duty, permanently sealed bearings at the front and rear of the shaft.