Internal gear pump Model GP81EMR-1U2B2 GP: General Purpose, mono block pump in cast iron 81: Pump size DN 80-3" E: Suction/Discharge connection in-line M: Sealing with single mechanical shaft seal 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: Bearing: Idler bush: Bronze, idler pin: Hardened 16 MnCr5 B: Main bearing: Bearing bush-Ball bearing, Shaft-St.60.2 2: Single mechanical shaft seal