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Pump Catalog

Pump Catalog Compressors & Vacuum Pumps MB-21



Housing body Cast aluminum
Bellows AM-350 stainless steel
All other wetted surfaces 300 Series Stainless Steel except for Valve Assembly; Teflon® Valve Gaskets; Viton® O-Rings
Bearings Permanently lubricated ball type
Weight 6 lbs (7.2 lbs for MB-21E)
Port connections 1/8" NPT


Standard 115V (220V/240V for MB-21E) 50/60Hz
Current at 115V/60Hz 2.3 Amps (max)
Motor specification 1/40 HP Shaded Pole induction motor with ball bearings and thermal overload protection (Permanent Capacitor Induction Type for MB-21E)
Operating speed @ 60 Hz 2500 RPM (3400 RPM for MB-21E)
Insulation Class B (Class F for MB-21E)
Curves Plotted at 2500 RPM.


Product Drawing
Senior PN: 28649, 40895

Product Options Senior PN
MB-21 – TEFLON VALVE 28649
MB-21 – VITON VALVE 40895

MB-21 3W

Product Drawing
Senior PN: 28825

Product Options Senior PN
MB-21 3W – 3 WIRE CORD NO FUSE 28825


Product Drawing
Senior PN: 48725, 48725-1, 48725-2

Product Options Senior PN
MB-21E – 240V, 50 Hz TEFLON VALVE 48725
MB-21E – 240V, 50 Hz VITON VALVE 48725-1
MB-21E – 240V, 50 Hz TEFLON VALVE W/O MOTOR 48725-2