Rubber Molded Dummy Connector - 3 Pin Male RMG-3-MPD — protective dummy plug (male) for rubber moulded underwater connectors. Rated 4,000 PSI in unmated condition. Protects connector face from contamination, biofouling, and mechanical damage during storage and single-ended deployment. Mates with RMG-3-FS female socket.
The Rubber Molded Dummy Connector - 3 Pin Male RMG-3-MPD is a purpose-designed protective dummy connector that protects the face of an unmated rubber moulded underwater connector during storage, handling, and single-ended deployment at depth. When a connector in the system is not mated to its counterpart — during instrument deployment with only one end connected, during storage between dives, or during single-cable lowering operations — the open connector face is vulnerable to contamination, biofouling, physical impact, and hydrostatic pressure crushing of exposed contact areas.
The dummy connector provides a fully sealed, 4,000 PSI rated closure for the open face — maintaining the depth rating of the unmated connector and preventing any contamination of the O-ring seat and contact area that would degrade the next mating cycle.
| Parameter | Specification |
|---|---|
| Function | Protective dummy — seals unmated connector face at depth |
| Mates With | RMG-3-FS female socket |
| Pressure Rating (unmated) | 4,000 PSI |
| Body Material | Neoprene, integral moulded |
| Seal Type | Buna N O-ring face seal (same as live connector mating) |
| Operating Temperature | -55°C to +85°C |
| Contact Pins | None (LP rated, no contacts required) |
| Scenario | Recommended Dummy | Reason |
|---|---|---|
| Storage between dives (any depth) | Either LP or HP | Depth not relevant; contamination protection is the purpose |
| Single-ended deployment <4,000 PSI | LP dummy (no contacts) | Lower cost; depth rating sufficient; contacts not needed |
| Single-ended deployment 4,000–20,000 PSI | HP dummy (with contacts) | Contacts required to maintain O-ring seat geometry at full pressure |
| Long-term mooring (biofouling risk) | HP dummy | Biofouling grows into contact cavities; HP dummy fills cavity to prevent ingress |
After removing a dummy connector from a live connector face, inspect the live connector O-ring seat for any contamination transferred from the dummy. Rinse with fresh water, inspect the O-ring for damage, and re-grease with silicone lubricant before mating the live connector. Store dummy connectors in a clean, sealed bag between uses — they are as susceptible to contamination as the live connectors they protect.
Always order one dummy connector per unmated end in your system — every open connector face in a subsea system should have a rated dummy installed whenever the connector is not mated to its live counterpart.
4,000 PSI | Mates with RMG-3-FS female socket | Neoprene moulded | Storage and deployment protection
