The RMG-4-FS is an in-line 4-socket RMG Rubber Molded connector rated to 300 m (30 Bar), 250 V DC/AC / 10 A per contact (40 A total). Flexible rubber over-mould body for commercial diving umbilical in-line splicing. The Female Socket configuration mates with the MP (male pin) counterpart.
At a glance: RMG-4-FS | RMG | 4 pin | Female Socket | 250 V DC/AC | 10 A/contact | 40 A total | 300 m | IMCA D 035
Key Design Features
- 4-Pin Female Socket In-Line: Direct cable-run splice without panel feedthrough.
- 300 m (30 Bar) Wet-Mate Rated
- 250 V DC/AC / 10 A Per Contact
- Flexible Rubber Over-Mould Body: Impact-resistant, buoyant.
- Push-to-Mate with Locking Sleeve: Tool-free with thick diving gloves.
- Gold-Plated Contacts: Contact resistance <0.01 Ohm; IR >100 Mohm.
- IP68 / IMCA D 035 Compliant
- Factory Cable Assemblies Available
Electrical and Mechanical Specifications
| Parameter | Value |
|---|---|
| Model number | RMG-4-FS |
| Number of contacts | 4 |
| Rated voltage | 250 V DC/AC rms |
| Rated current | 10 A per contact (40 A total) |
| Contact resistance | < 0.01 Ohm |
| Insulation resistance | > 100 MOhm (500 V DC) |
| Depth rating | 300 m (30 Bar) |
| Wet-mate cycles | > 500 |
| IP rating | IP68 (30 m / 30 min) |
| Standard | IMCA D 035 |
| Body material | Rubber over-mould (natural/synthetic) |
| Contact material | Gold-plated beryllium copper |
| O-ring material | NBR standard; EPDM/FKM on request |
| Operating temperature | -40 C to +60 C |
| Storage temperature | -40 C to +80 C |
Typical Applications
- Commercial diving umbilical in-line splice connections
- Diver umbilical extension and distribution cables
- Bell diving umbilical in-line joints
- Saturation diving system umbilical mid-run connections
- Diver video camera power and signal cables
- Diver helmet communications cable connections
- Hot-water suit supply umbilical electrical connections
- IMCA-compliant offshore DSV diving spread umbilicals
Why Choose the RMG-4-FS?
Purpose-Built for Commercial Diving
Rubber body flexibility, push-mate simplicity, and glove-friendly geometry designed for commercial diving umbilical service.
300 m / IMCA D 035 Compliant
Every connector meets 300 m depth and IMCA D 035 requirements for all commercial offshore diving operations.
Complete Matched System
Matched MP/FS counterparts, locking sleeves, dummy plugs, and factory assemblies from one supplier.
Stock Delivery
Standard RMG/RMK configurations ship from stock. Custom OEM assemblies with short lead times.
20+ Years Subsea Heritage
RV Power Group has supplied connectors to commercial diving contractors worldwide for over 20 years.
Complete RMG/RMK Family Table
| Model | Description | Type | Pins |
|---|---|---|---|
| RMG/RMK-SERIES | RMG/RMK Series Commercial Diving Connector Range Overview | OVERVIEW | - |
| RMG-2-MP | RMG-2-MP In-Line Rubber Molded Connector 2 Pin Male Plug Diver Umbilical | IL | 2 |
| RMG-2-FS | RMG-2-FS In-Line Rubber Molded Connector 2 Socket Female Diver Umbilical | IL | 2 |
| RMG-3-FS | RMG-3-FS In-Line Rubber Molded Connector 3 Socket Female | IL | 3 |
| RMG-3-MP | RMG-3-MP In-Line Rubber Molded Connector 3 Pin Male | IL | 3 |
| RMG-4-FS | RMG-4-FS In-Line Rubber Molded Connector 4 Socket Female Diver Umbilical Comms | IL | 4 |
| RMK-5-FS | RMK-5-FS In-Line Rubber Molded Connector 5 Socket Female | IL | 5 |
| RMG-4-MP | RMG-4-MP In-Line Rubber Molded Connector 4 Pin Male | IL | 4 |
| RMK-5-MP | RMK-5-MP In-Line Rubber Molded Connector 5 Pin Male | IL | 5 |
| RMK-6-FS | RMK-6-FS In-Line Rubber Molded Connector 6 Socket Female | IL | 6 |
| RMK-6-MP | RMK-6-MP In-Line Rubber Molded Connector 6 Pin Male | IL | 6 |
| G-FLS-D | G-FLS-D Female Locking Sleeve 2 3 4 Pin Female RMG Series | LS | - |
| G-MLS-D | G-MLS-D Male Locking Sleeve 2 3 4 Pin Male RMG Series | LS | - |
| K-FLS-D | K-FLS-D Female Locking Sleeve 5 6 Pin Female RMK Series | LS | - |
| K-MLS-D | K-MLS-D Male Locking Sleeve 5 6 Pin Male RMK Series | LS | - |
| XSG-2-BCL | XSG-2-BCL Rubber Molded Bulkhead Connector 2 Pin Male | BCL | 2 |
| XSG-3-BCL | XSG-3-BCL Rubber Molded Bulkhead Connector 3 Pin Male | BCL | 3 |
| XSG-4-BCL | XSG-4-BCL Rubber Molded Bulkhead Connector 4 Pin Male | BCL | 4 |
| RMG-4-BCL-SS | RMG-4-BCL-SS Rubber Moulded Bulkhead Pin Connector 4 Pin | BCL | 4 |
| RMG-4-BCL-SS-R | RMG-4-BCL-SS Round Body Rubber Moulded Bulkhead Connector 4 Pin | BCL | 4 |
| XSG-5-BCL | XSG-5-BCL Rubber Molded Bulkhead Connector 5 Pin Male | BCL | 5 |
| XSK-5-BCL-SC | XSK-5-BCL-SC Rubber Molded Bulkhead Connector 5 Pin Male Round Body | BCL | 5 |
| XSG-6-BCL | XSG-6-BCL Rubber Molded Bulkhead Connector 6 Pin Male | BCL | 6 |
| RMG-2-FSD | RMG-2-FSD Rubber Molded Dummy Connector 2 Socket Female Protective Cap | DUM | 2 |
| RMG-2-MPD | RMG-2-MPD Rubber Molded Dummy Connector 2 Pin Male Protective Cap | DUM | 2 |
| RMG-3-FSD | RMG-3-FSD Rubber Molded Dummy Connector 3 Socket Female Protective Cap | DUM | 3 |
| RMG-3-MPD | RMG-3-MPD Rubber Molded Dummy Connector 3 Pin Male Protective Cap | DUM | 3 |
| RMG-4-FSD | RMG-4-FSD Rubber Molded Dummy Connector 4 Socket Female Protective Cap | DUM | 4 |
| RMG-4-MPD | RMG-4-MPD Rubber Molded Dummy Connector 4 Pin Male Protective Cap | DUM | 4 |
| RMK-5-FSD | RMK-5-FSD Rubber Molded Dummy Connector 5 Socket Female Protective Cap | DUM | 5 |
| RMK-5-MPD | RMK-5-MPD Rubber Molded Dummy Connector 5 Pin Male Protective Cap | DUM | 5 |
| HI-USE-2M2F | Hi-Use Connector 2 Male Pins and 2 Female Sockets Diver Helmet | SPEC | 4 |
| HI-USE-SLEEVE | Hi-Use Connector Potting Sleeve 2 Male Pins 2 Female Sockets | SPEC | 4 |
| TERM-Y | Termination Y Splice TermY SCIL8M to MCIL3F and RMG3F Signal Distribution | SPEC | - |
| OEM-DIVING | OEM Underwater Connectors and Cables for Commercial Diving Systems | SPEC | - |
| XSG-1-BCL | XSG-BCL Rubber Molded Bulkhead Connector 1 Pin Male | BCL | 1 |
| EO-CABLE | EO Cable Wet Electro-Optical Connector EO Cord Diver Video and Comms | SPEC | - |
How to Select the Right RMG/RMK Connector
| Requirement | Select |
|---|---|
| 2-pin in-line pair | RMG-2-MP + RMG-2-FS |
| 3-pin in-line pair | RMG-3-MP + RMG-3-FS |
| 4-pin in-line pair | RMG-4-MP + RMG-4-FS |
| 5-pin in-line pair | RMK-5-MP + RMK-5-FS |
| 6-pin in-line pair | RMK-6-MP + RMK-6-FS |
| 2/3/4-pin panel bulkhead | XSG-2/3/4-BCL |
| 5/6-pin panel bulkhead | XSG-5/6-BCL or XSK-5-BCL-SC |
| Locking sleeve - 2/3/4-pin female | G-FLS-D |
| Locking sleeve - 2/3/4-pin male | G-MLS-D |
| Locking sleeve - 5/6-pin female | K-FLS-D |
| Locking sleeve - 5/6-pin male | K-MLS-D |
| Dummy cap - 2-pin female socket | RMG-2-FSD |
| Dummy cap - 2-pin male pin | RMG-2-MPD |
| Diver helmet combination | HI-USE-2M2F + HI-USE-SLEEVE |
| Custom OEM cable assembly | OEM-DIVING - contact sales |
Frequently Asked Questions
Q: What depth is this connector rated to?
A: 300 m (30 Bar) covers all commercial surface-supplied and bell diving.
Q: What voltage and current are supported?
A: 250 V DC/AC rms, 10 A per contact.
Q: Is a locking sleeve required?
A: Yes - mandatory before every deployment to prevent accidental de-mating.
Q: Can this connector be mated underwater?
A: Yes - wet-mate rated to 300 m. De-energise circuit before mating underwater.
Q: What is the service life?
A: Over 500 wet-mate cycles with proper maintenance. Replace O-rings every 2 years.
Q: Do you supply factory-terminated cable assemblies?
A: Yes - contact [email protected] with cable spec and length.
Q: Are dummy plugs available?
A: Yes - FSD/MPD range covers all pin counts.
Q: Is the connector IMCA compliant?
A: Yes - meets IMCA D 035 requirements.
Q: What is the mating counterpart?
A: MP (male pin) mates with FS (female socket). Both available in all RMG/RMK pin counts.
Installation, Mating and Maintenance Guidelines
Mating Procedure
(1) Inspect contacts - clean if contaminated. (2) Inspect O-rings - apply silicone grease. (3) Align and push straight - no twisting. (4) Push until fully seated. (5) Install locking sleeve immediately. (6) IR test before energising.
Deck Handling
Install dummy plugs before water entry. Rinse with fresh water after seawater exposure. Inspect rubber body after every dive. Replace any connector with damaged body immediately.
Storage and O-Ring Maintenance
Store with dummy plugs installed, dry and UV-shaded. Lubricate O-rings before each use. Replace O-rings every 2 years or on visible damage.
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