Maradyne 50 Series Spin-on Filter Heads

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SKU: M50X Category:

Maradyne 50 Series Spin-on Filter Heads feature solid aluminum construction to provide strength and durability at mid-range pressures (200 PSI). They accept numerous types of spin-on cartridges to match your application and are compatible with P77 pressure gauges.


  • Port Sizes – 1 1/4″ NPT or SAE-20
  • Optional Bypass Valve – Glass fiber filled nylon with 25 PSI cracking pressure, +/- 10%

Technical Specifications

  • Post Size – 1-1/2” 16 UN 2A
  • Working Pressure – 75 PSI (5.1 BAR) maximum without by-pass; 200 PSI (13.7 BAR) maximum with bypass
  • Flow Capacity – 50 GPM (378 LPM)
  • Operating Temperature – 225°F (107°C) maximum
  • Fluid Compatibility – Petroleum based oils, high water based fluids, water glycols, and oil/water emulsions
Part NumberPort SizeBypassIndicator Ports
5004XJ251 1/4" NPTNo BypassVisual Delta P Indicator, Left Side (25 PSI)
50044A1 1/4" NPT25 PSI2x 1/8" NPT Return Ports (Plugged)
50044C1 1/4" NPT25 PSI4x 1/8" NPT Ports (Return & Suction - Plugged)
50044K251 1/4" NPT25 PSIVisual Delta P Indicator, Right Side (25 PSI)
50184ASAE-2025 PSI2x 1/8" NPT Return Ports (Plugged)

Drawings for Maradyne 50 Series spin-on filter head Pressure drop graph for Maradyne 50 Series spin-on filter head

Compatible Elements

Part NumberNominal RatingLengthMedia
FPE50-03N3 microns7"Cellulose
FPE50-10G (Marion S-58-MG)10 microns7"Microglass
FPE50-10N (Marion S-58)10 microns7"Cellulose
FPE50-25N (Marion S-59)25 microns7"Cellulose
FPE50-100M100 microns7"Wire Mesh
FPE70-03G3 microns11"Microglass
FPE70-03N3 microns11"Cellulose
FPE70-10G (Marion S-58-MGE)10 microns11"Microglass
FPE70-10N (Marion S-58-E)10 microns11"Cellulose
FPE70-10W10 microns11"Water Removal
FPE70-25N (Marion S-59-E)25 microns11"Cellulose
FPE70-100M100 microns11"Wire Mesh

Other configurations are available, including bypass valve cracking pressures as low as 3 PSI. Contact us for more information.


Maradyne, Marion, and FPC Filtration Products Corporation logos

Additional information

Weight N/A
Dimensions N/A