API Couplers

API Couplers are manufactured to APIRP1004, the industry standard for bottom loading and vapour recovery on tankers at terminals.

APIRP1004 guides the manufacturer as to the uniform features that should be provided to permit loading of a tank vehicle with a standard 4-inch adaptor. Key to the standard is commonality of connection profiles meaning that API Couplers from different manufacturers should be interchangeable.

We are UK distributors for Emco Wheaton, a manufacturer who has been at the forefront of API Coupler development and produce the most comprehensive range of API couplers available. Each Emco Wheaton coupler incorporates a host of patented features which help provide trouble free operation and ensure a clean, spill free loading area.

Emco Wheaton couplers are approved world-wide and are standardised by many of the world’s major oil companies.


J0451 – Standard API Couplerj0451-2

The J0451 is the most economical API Coupler providing safe and leak-free operation with easy and comfortable handling.

The J0451 API Coupler has been the industry standard for over 30 years and has recently been re-engineered to set an even higher standard in API Couplings.

Key features include;

  • Lightweight body is easy to use and comfortable to handle
  • Bevelled lip improves ease of operation and improves load distribution
  • Maintenance friendly design allows in-situ nose seal replacement
  • Seal and gaskets contained in recessed cavity for tight seal
  • Safe, leak-free operation
  • Quality forged aluminium lever
  • Roller bearing in operator lever assures easy and smooth open/close action
  • Seal options include: Viton (-051), Buna (-052) and Low Temperature (-053)
  • Pressure rating: 10 bar (150 PSI)
  • Weight: 9.8 kg (21.61 lbs)
  • Connection: 4″ tank truck flange (APIRP1004)


J0452 – Snap-on API Couplerj0452

The J0452 API coupler is the most advanced coupler available in the global market today with snap-on/snap-off design &
superior sealing technology.

Key features include;

  • Ergonomic lever and grab handles make for fast, easy connection and disconnect
  • Lowest leakage in its class
  • Bevelled lip improves ease of operation and improves load distribution
  • Maintenance friendly design allows in-situ nose seal replacement
  • High performance nose seal
  • Automatic snap-on connection
  • Hard coated anodised body
  • Cross-over prevention / magnet sleeve
  • Coloured wear bumper
  • Seal options include: Viton (-051), Buna (-052) and Low Temperature (-053)
  • Design pressure: 16 bar (240 psi)
  • Weight: 9.76 kg (21.47 lb)
  • Connection: 4″ tank truck flange (APIRP1004)


J0452P – Snap-on API Coupler with Integrated Pump & Filter

The J0452P offers all of the features of the standard J0452 but with the added benefit of an integrated pump and filter. As the collar of the coupler is withdrawn, the pump draws any liquid residue from the bottom of the coupler face to prevent it spilling onto the loading area.

The excess liquid is drawn through a filter and into a small reservoir within the coupler. When the coupler is next connected, the fluid contained within the reservoir is shot back into the process. A simple addition which makes for a much cleaner and safer loading bay.


J0550 – Vapour Couplercapture

The J0550 self-sealing Vapor Coupler is specifically designed to allow high transfer rates of vapour from tank truck back to the loading rack during multi-compartment bottom loading.

The J0550 has the lowest pressure drop in its class and when incorporated into a well-engineered vapour return system will allow higher flow rates at reduced pressure drops.

Key features include;

  • Self-sealing valve with spring close poppet
  • Low pressure drop
  • High flow
  • Mates to all available vapour adapters made in accordance with the API RP1004
  • Lightweight aluminium body
  • Viton seals
  • Hard wearing brass cams
  • Product drain plug
  • 4″ TTMA flanged inlet
  • 4″ Female cam and groove outlet


If you have a requirement for API couplers or any other equipment for fluid transfer or storage we will be happy to assist. 




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API Couplers

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