Tuthill M Series magnetic coupled internal gear pumps


Tuthill’s M Series magnetic coupled pumps feature a robust design to better withstand the unexpected.

Process upsets and cold starts can result in decoupling and permanent magnet damage that results in costly repairs and unplanned downtime. Using generously sized high temperature magnets can often prevent this situation. That is what Tuthill delivers in the M series magnetically coupled sealless process pumps. With more robust components and superior engineering, these pumps are much less likely to decouple in upset, cold or high viscosity situations. Even in the event of decoupling or run dry, our high temperature magnets are more likely to survive than standard low temperature magnets found in other pumps. Invest in a better pump to avoid those costly magnetic drive pump repairs.


Flow Capacities
.5 to 80 GPM (.11 to 18.2 m3/hr)
Pressure Up to 500 psi (see model chart)

Viscosity up to 75,000 ssu (16,500 centistokes)

Temperature 300°F (149°C) standard construction
500 °F (260°C) high temperature construction

Difficult to seal liquids such as: Isocyanate, Styrene, Sodium Hydroxide.
Hazardous liquids such as: Nitrocellulose.
Liquids carrying toxic vapors, solvents, etc.
Suitable for working environments where no leakage can be tolerated.


 Model Number Max GPM
Port Size
ML0I 1.8 500 Iron Close-Coupled .5" NPT Opposite
ML1I 3.2 500 Iron Close-Coupled .5" NPT Opposite
ML2I 6.2 500 Iron Close-Coupled 1" NPT Opposite
MC2I 9 100 Iron Close-Coupled 1" NPT Top
MC3I 18 100 Iron Close-Coupled 1.25" NPT Top
MC4I 36 100 Iron Close-Coupled 1.5" NPT Top
MC5I 62 100 Iron Close-Coupled 1.5" NPT Top
MC6I 84 100 Iron Close-Coupled 2" NPT Top
MG015I 15 200 Iron Base Mounted 1.5" NPT Opposite
MMG030I 30 200 Iron Base Mounted 1.5" NPT Opposite
MG080I 80 200 Iron Base Mounted 2" 125# ANSI Opposite
MG015S 12 150 Stainless Base Mounted 1.5" NPT Opposite
MG030S 22 200 Stainless Base Mounted 1.5" NPT Opposite
MG080S 56 200 Stainless Base Mounted 2" 150# ANSI Opposite

Drive Arrangements:
Direct Drive Speeds Available to 1750 RPM.
Compact close-coupled arrangement for ML and MC models.
Gear reduced arrangements available for the MG models.

Materials of Construction:
Cast Iron or Stainless Steel Wetted Parts (See model chart).
Stainless Steel Inner Magnet Assembly and Containment Shell.
Samarium Cobalt High Temperature Rare Earth Magnets.
Carbon Bushings.
Teflon Encapsulated Viton O-Rings.

Generously Sized Magnetic Couplings (Helps Avoid Upset Condition Decoupling).
High Temperature Rare Earth Magnets Supplied As Standard (Better Withstands Temperature Spikes Seen in Upset Conditions).
Patented Magnet Area Cooling Path for Effective Heat Dissipation.
Thrust Control for Maximum Life and Reliability.
Skid Rings to Prevent Containment Shell Damage.

Options: Relief Valves, High Temperature Pump Construction to
500 °F (260°C), Optional O-Ring Materials


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