Chemical Injection RJ API Flange Access Fitting Assembly Model 58

Cosasco high pressure chemical injection fittings allow safe, controlled, and easy injection under full operating pressure, dramatically reducing downtime. Cosasco offers a wide range of delivery options from standard NPT to robust flanged side tees for chemical injection into high pressure systems.

A variety of injection tubes, quills, and nozzles can be used to provide the most efficient delivery and dispersion for a given application. A Cosasco Retriever and Service Valve are used to safely install and retrieve injection and sampling components under operating conditions that need to be replaced due to a change in injection requirements or if maintenance is necessary.

Learn about Cosasco SAFR Services to protect and lengthen the life of your Chemical Injection Access Fittings!


  • Mounting — 2-1/16” API Flange RJ
  • For Mating with Standard Flanges, no Welding, Less Compact than Model 50
  • Standard Temperature Rating with Viton/Teflon Seals: — From -15° F (-26° C) Up To +400° F (+204° C)
  • Pressure Rating — As Flange Size
  • Meets NACE MR0175 and MR0103
  • Canadian Registration (CRN) and Conformity to Pressure Equipment Directive (PED)


  • Access Under Pressure — Maintenance or removal under full operating pressure
  • Integral check valve (standard)
  • Robust, machined construction
  • Injection/Sampling Components available in highly corrosion resistant alloys
  • Safely inject a wide variety of chemicals
  • Available with ACME Threaded Internal Configurations
  • Various injection tubes, quills, and nozzles available


Cosasco chemical injection equipment may be used with a wide variety of chemicals and across a broad range of industries & applications.

  • Oil & Gas
  • Chemical Processing
  • Pipeline
  • Heavy Manufacturing
  • Cooling Systems

Inject a wide variety of chemicals.

  • Corrosion/Scale Inhibitors
  • Biocides
  • Boiler Water Chemicals
  • Demulsifiers
  • Oxygen Scavengers
  • Oxidants
  • Flocculants
  • Neutralizing Agents
  • Dewaxers


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