Internal gear pump Model HD152E-1U22B - P/N 2166 HD: Heavy duty pump, Complete with motor on a common baseplate through flexible coupling 152: Pump size DN 150 - 6" 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 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-impregnated, non-asbestos packing