Internal gear pump Model CD81ER-3U22B - P/N 3514 CD: Chemical Duty pump in St.St., Complete with motor on a common baseplate through flexible coupling 81: Pump size DN 80 - 3 " E: Suction/Discharge connection in-line R: Safety valve, single acting for protection against excess pressure 3: Casing & cover: G-X 6 CrNiMo 27 5, Rotor/Idler: X 8 CrNiMo 27 5, Shaft: X 8 CrNiMo 27 5 U: Idler bearing and main bearing lubricated by pump medium 2: Idler bush: Bronze, idler pin: Hardened 16 MnCr5 2: Bearing bush: Bronze, Shaft: X 8 CrNiMo 27 5 B: Shaft seal: Teflon-impregnated, non asbestos packing