Dixon 5500 Series 4 in. Aluminum API Rack Coupler w/ FKM-B (Viton) Seal & Aluminum Handle

4 in.
21.00 LBS
WARNING: This product may contain a chemical known to the State of California to cause cancer & reproductive harm. For more information, go to www.P65Warnings.ca.gov.
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Dixon's 5500 API Rack Coupler with FKM-B (viton) seal and aluminum handle features a locking five-cam design that provides easy alignment and a tight connection. When combined with API adapters, these couplers are suitable for rail car and tank truck loading or unloading.

FKM-B Operating Temperature: -10°F to 400°F (-23°C to 204°C)


  • Locking five-cam design provides easy alignment and tight connection
  • Modular design allows various face seal combinations to be compatible with different alternative fuels, performance levels, and applications
  • Replaceable nose seal can be changed without removing coupler from loading arm
  • Fully interlocked collar prevents fitting from opening when disconnected and can not be disconnected while opened
  • 4 in. TTMA inlet mounting flange connection
  • Ball-end handle for easy and comfortable operation
  • No special tools needed for maintenance
  • Exclusive 5 year mechanical manufacturer warranty - Normal wear and tear items (including seals) not covered


  • Inlet: 4 in. TTMA
  • Body: 356 T6 Aluminum Anodized Hard-Coat
  • Cam: Stainless Steel
  • Poppet: 356T6 Aluminum Anodized Hard-Coat
  • Seal: FKM-B (viton)
  • FKM-B Operating Temperature: -10°F to 400°F (-23°C to 204°C)
  • Link, Shaft, Pin, Crank: Hardened 17-4PH Stainless Steel
  • Handle: Aluminum, Stainless Steel
  • Max Flow Rate: 1,000 GPM (600 GPM at 3 PSI pressure drop)
  • Approvals: Fully compliant with API RP1004:2003 specifications


Maintenance & Operating Instructions (PDF Download)