Internal gear pump Model HD33ER-1U22B - P/N 2734 HD: Heavy Duty pump in cast iron complete with electric motor through flexible coupling 33: Pump size DN 32 - 1 1/4 " E: Suction/Discharge connection in-line R: Safety valve, single acting for protection against excess pressure 1: Casing & cover: GG-25, Rotor/Idler: GG-25, Shaft: St.60.2 U: Idler bearing and main bearing lubricated by pump medium 2: Idler bush: Bronze, idler pin: Hardened 16 MnCr5 2: Bearing bush: Bronze, Shaft: St.60.2 B: Shaft seal: Teflon-impergenated, non-asbestos packing