Controls and Communication Connectors | OneSubsea

Controls and Communications Connectors

Diamould electrical connectors

The controls and communications connector range in our portfolio of Diamould electrical connectors satisfies the increasing demands from the subsea industry to provide a highly reliable subsea connection system for subsea controls, distribution, and instrumentation applications.


  • No need for expensive long-term protective covers
  • Extended tracking distances to earth
  • Axial stackup capability built into plug connector
  • Crimped cable terminations that eliminate quality issues associated with soldering
  • Dual-barrier pressure-balanced design for minimized stress across seals
  • Subsurface mate and demate with no loss of operational integrity
  • Resistance to ingress of sand and silt
  • Qualification to 14,750 ft [4,500 m]
  • Maintenance-free design
  • Extensive compliance
    • ISO 13628-6
    • Petrobras I-ET-3000.00-1500-823-PEK-001
    • API Spec 17F SEAFOM TSD-02
    • Subsea Instrumentation Interface Standardization (SIIS) Level 3
    • Statoil TR-2390 Rev. 2
Diamould controls and connectors for subsea production.
>100 years
Collective subsea connector experience
±0.20 in
Axial stackup capability
Contact versions available
14,750 ft
Water depth rating

Based on unique and patented technology, our controls and communications connectors provide the most advanced solution for subsea distribution and controls connectivity on the market today.

Technical specs, applications, and more
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Less corrosion risk with protected male contact pins

To provide additional protection subsea, conventional ROV connectors require full electrical dummy connections, which add both increased expense and additional ROV intervention subsea. The controls and communications connector has a unique protected male pin system that provides immediate corrosion protection as soon as the connector demates, thus eliminating the need altogether.

Improved service quality with crimp termination

Traditional methods for cable termination involve soldering into back of the wet-mateable connectors. To mitigate any potential service quality concerns, OneSubsea developed a mechanical crimp and latch boot system to provide a more repeatable alternative.

No biofouling with acetal liners

A unique acetal liner system within the ROV connector construction addresses concerns over the long-term effects of biofouling subsea, especially in warmer waters. The fixed volume and debris seal system ensure the mitigation of conditions that accelerate the growth of marine life and calcareous deposits.

Portfolio overview

The product variants within the range offer an equivalent to typical industry standards with additional technical and commercial benefits while remaining configurable to satisfy project-specific requirements.

Wet-mateable connector

Developed and patented in 2002, the wet-mate Diamould connector range is based on field-proven, patented techniques that optimize performance. The wet-mateable function is achieved through the dual-barrier sealing systems in the plug units, providing independent mechanical and electrical sealing. The Diamould connector is unique in that the receptacle connector also has contact protection by means of a dielectric-filled compensated wiper system.

Connector-level assemblies

Connector-level assemblies are available in 4-, 7-, and 12-contact configurations for

  • flying ROV plug and receptacle
  • compliant ROV-mounted plug and receptacle
  • bulkhead-mounted ROV plug and receptacle
  • stabplate plug and receptacle
  • diver-mate plug and receptacle
  • parking and test connectors.

Instrument harness assemblies

To enable the use of equipment-mounted instruments, the connector-level assemblies can be configured as necessary with oil-filled hoses. Termination and validation of pressure and temperature transducers are performed using a calibrated test unit before and after hydrostatic testing. Depending on the configuration of the harness, a junction or marshalling box may be required.

Junction boxes

The junction box is available in two variants (one in and up to seven out)

  • Open oil communication between junction box and hose (hose compensated)
  • Individually sealed hoses with additional water-blocking feature (bladder compensated)

Electrical flying leads (EFLs)

Built for your requirements, our fully factory-tested connector and oil-filled hose assemblies are pressurized internally to 145 psi [10 bar]. All EFLs are then subsequently pressure- and factory-acceptance tested before dispatch. Hoses are supplied in 13- and 18-mm bore options to accommodate different project wiring configurations. For longer EFL needs, a qualified hose splice is used with continuous lengths of cable up to 650 ft [200 m].

Ethernet flying leads

Qualified to SIIS Level 3, the 12-way Ethernet cable solution uses a unique termination method to ensure dual-redundant 100-Mbps Ethernet with minimal crosstalk. The system incorporates four power lines and two screened Ethernet channels, accommodating both distribution and instrumentation applications with a maximum length of 300 ft [90 m].