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DC4M Underwater Circular Series Connector Dummy Plug 4 Pin Contact male

DC4M Underwater Circular Series Connector Dummy Plug 4 Pin Contact male The Circular series offers the ability to combine signal and power within a single connector. Circular connectors are manufactured from high grade chloroprene rubber with different types of body material and feature a high depth rating. The connectors are available in different standard shell sizes with contacts rated at 300 to 600 V up to 5 to 10 A. For easy integration with systems and equipment, Circular connectors are available with dedicated cables, locking sleeves, pressure proof dummy connectors and other accessories.

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Description

The DC4M is a SubConn® Circular Male Dummy Cap / Protective Plug designed to protect the unmated male pin face of 4-contact Circular series connectors from seawater ingress, biofouling, sediment contamination, and mechanical damage during storage, deck handling, and deployment. Rated to 1,400 Bar (20,300 psi) mated equivalent pressure, the DC4M is pressure-balanced and can be deployed on any unmated Circular connector face without depth limitation.

4-Contact Circular Dummy Cap | 1,400 Bar Pressure Balanced | Protects 4-Pin Female Face | SubConn® Standard Compatible

Key Design Features

  • Circular Male Dummy Cap — protects the male pin face of 4-contact SubConn® Circular series connectors
  • Pressure-balanced design — rated to 1,400 Bar / 20,300 psi; can be deployed at any ocean depth without flooding or damage to the protected connector face
  • 500+ deployment cycles — cap mate/demate rated for the full service life of the connector it protects
  • Chloroprene rubber body — chemical resistance to seawater, hydraulic oil, and biofouling agents; −4 °C to +60 °C
  • SubConn® Circular standard geometry — identical locking sleeve and keyway geometry to SubConn® Circular DCs; full field interchangeability
  • Colour-coded snap ring — enables rapid visual identification of cap vs. live connector during deck operations

Specifications

Parameter Specification
Protected Connector Face 4-contact Circular Female (pin or socket face)
Equivalent Pressure Rating 1,400 Bar / 20,300 psi (pressure balanced)
Open-Face Pressure 800 Bar / 11,600 psi
Deployment Cycles > 500
Operating Temperature (water) −4 °C to +60 °C
Operating Temperature (air) −40 °C to +60 °C
Body Material Chloroprene rubber
Snap Ring Stainless steel AISI 302 (colour-coded)
Locking Sleeve POM or stainless steel
Compatible Connectors 4-contact SubConn® Circular IL, BH, OM series (Female face)

Typical Applications

  • Deck storage protection — caps unmated 4-pin Circular connector faces during ROV deck operations, reducing contamination-related connection failures
  • Long-term storage — protects gold-plated contact faces from chloride corrosion, dust, and mechanical contact damage during equipment storage and transit
  • Subsea parking — pressure-balanced dummy cap enables deployment of the cap on any unmated underwater connector face without depth limitation
  • Observatory junction boxes — protects unused port connections in multi-port subsea junction boxes and instrument frames
  • ROV tooling skids — protects connector faces on tools not deployed in a given dive

Frequently Asked Questions — DC4M

Q: What connectors does the DC4M protect?
A: The DC4M protects the male pin face of all 4-contact SubConn® Circular series connectors — including IL4F or BH4F and compatible models. The locking sleeve geometry is identical to the SubConn® Circular standard.

Q: Can the DC4M be deployed underwater with the connector?
A: Yes. The DC4M is pressure-balanced and rated to 1,400 Bar / 20,300 psi — it can be deployed at any ocean depth on an unmated connector face without flooding or damage. It is designed specifically for subsea use during ROV tooling operations where some connector faces remain unmated during the dive.

Q: How many times can the DC4M be applied and removed?
A: Rated for more than 500 application/removal cycles — matching the full mating cycle specification of the Circular connector series it protects.

Q: Does the DC4M require lubrication?
A: Light application of dielectric grease to the O-ring sealing surface is recommended, particularly for repeated deck-side application/removal cycles. After recovery from seawater, flush with fresh water and re-apply grease before storage.

Q: What is the colour coding on the DC4M snap ring for?
A: The colour-coded snap ring enables rapid visual differentiation between live connector ends and protected/capped ends during deck operations — a critical safety feature on ROV tooling skids and multi-outlet junction boxes where misconnection must be prevented.

Installation & Maintenance

  • Inspect the connector face and cap sealing surface before every application — remove debris or salt deposits that could prevent full O-ring seating
  • Apply dielectric grease to the O-ring before capping, particularly for subsea deployment
  • Verify the locking sleeve is fully engaged before deployment — a partially engaged dummy cap can flood the protected connector face under pressure
  • After recovery, flush the cap and connector face with fresh water; inspect O-rings for wear before re-use



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