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API Couplers-Bottom Loading Couplers

API Couplers-Bottom Loading Coupling
API Couplers-Bottom Loading Coupling

We all want the best in terms of loading systems. We want the fastest loading and unloading operations.

Commercial value is really important both in terms of capital investment and with regard to on-going operational costs, – so products that are both easy to use and maintain are key. Safety is critical, spill prevention and operator safety must be high on everyone’s agenda.

OPW loading equipment means peace of mind, the best quality money can buy, with decades of experience and offering value for money long-term.

OPW’s latest generation API Couplers (LYNX API coupling, 1005E3/1004D3 couplers ) combine all of the best features of API couplers in one device to provide a superior and effortless bottom loading experience.

OPW’s API Couplers are a proven performer at major oil loading-unloading terminals around the world and incorporate several new features that make it the most user-friendly coupler on the market.

API Couplers-API Coupling

Features & Specifications:

  • 5-Year Warranty.
  • Fast in-field replacement of the main seals, on or off the arm.
  • Quick and easy disassembly of entire coupler through U-pin design.
  • Automatic latching.
  • U-pin is secured when the TTMA flange is fastened to prevent the pin from coming out during service.
  • A variety of seals available to suit a range of applications.
  • Two operating handle sizes to suit customer preference.
  • Four “true-interlocking” stainless-steel latches ensure secure coupling and maximum safety.
  • High-quality components including a stainless-steel collar and hard anodised aluminium body for increased service durability and life.
  • Nominal product leakage during disconnect increases site safety.
  • Low risk of leakage because of a proven seal design.
  • Ergonomic operating handle and carry loop results in less physical strain on users.


Handle Length Short 5.9″ (150mm) or Long 7.8″ (200mm)
Seals Viton B, Viton GFLT, Nitrile/Buna, Fluorosilicone, FFKM
Max Working Pressure 80 psi (5.5 bar) (550 kPa)
Product Test Pressure 119 psi (8.2 bar) (820 kPa)
Design Pressure 363 psi (25 bar) (2500 kPa)
Max Surge Pressure 493 psi (34 bar) (3400 kPa)
Operating Temperature Viton B70: -4°F to 176°F (-20°C to 80°C); Viton GFLT: -20°F to 140°F (-29°C to 60°C); Nitrile/Buna: -40°F to 212°F (-40°C to 100°C); Fluorosilicone: -49°F to 350°F (-45°C to 177°C); FFKM: -40°F to 140°F (-40°C to 60°C)
Design Standard API RP 1004 8th EDITION 2003 – Bottom Loading and Vapour Recovery; AS5602-2009
Dismantling Removal of one U-pin enables the shaft assembly and main poppet to be withdrawn

• By industry standard 4″ (100 mm) TTMA Flange

• 8 holes Ø7/16″ on 5.8″ PCD, 6.6″ outside diameter (Ø11 mm on 149 mm PCD, 168 mm OD)

• Use spring washers when mounting coupler as per common industry practice

Adjustment or Service Refer to Maintenance Instructions document
Weight 19 lbs. (8.6 kg.)


Fast Disassembly, Less Downtime:

If you have 30 seconds and a screwdriver, you can disassemble LYNX API Coupler. Thanks to a U-pin design, loading-arm operators can perform coupler maintenance without special tools and do it quickly.


We supply a broad range of loading equipment and complete loading platforms, gantries and racks.

Contact us

If you would like to place an order or find out more, please email, call on +44 1726 844 707, or fill in a contact form here.