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office (361) 880-5353
fax (210) 824-2254

Duration Filter Systems

Sold Exclusively By

John Hopkins Unlimited Inc.

One Filter For All Engines And Processes

No more filter disposal ever and when it's installed with Duration oil centrifuge, your oil life can be extended by 100% or more in most cases. The best place for used oil is in your engine. Imagine one spare element that fits all your applications.  

ProductsPower Point File

John Hopkins is distributor for :

  • A1 Gasket
  • American BOA Inc
  • DCL International Inc.
    We have distributors in several locations nation wide and in several nations around the world. If your are interested in one of our products or would like to inquire about being a distributor, please contact us at:
  • Diesel Supply
  • IE William
  • Geartner Leasing
  • Fleetlife Inc.
  • Hose Of South Texas
  • Mac Tools
  • Shannon Enterprises
  • Summit Oil
  • Superbolt
  • TB Woods

We have several hundred filters in service world wide in every process in the industry. Owner John Hopkins pictured above.