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Overview
A Graviner MK6 oil mist detection system is only as reliable as the connections that link its detector heads to the central control unit. In a marine engine room environment — where heat, vibration, moisture, and the constant physical activity of maintenance and watchkeeping create real stress on every cable connection in the space — the junction box is the component that manages those connections cleanly, protects them from the environment, and ensures that the signal path between each detector head and the MK6 control unit remains intact and interference-free. When the junction box fails or is missing from a system that requires one, the result is unreliable detector connections, potential false alarms, and — in the worst case — a signal path that cannot be trusted to transmit a real alarm when it matters.
The Graviner MK6 Oil Mist Detector Junction Box, Part No. D4720-001-02, is the OEM-referenced junction box for the Kidde Graviner MK6 oil mist detection system. Available in configurations from 2-input to 14-input, it provides the wiring connection point for detector heads on MK6 installations where a centralised, protected connection enclosure is required — consolidating detector head cable connections in a single enclosure that is rated for the engine room environment and designed to integrate directly into the MK6 system wiring architecture.
The differentiating factor for this junction box over generic alternatives is its OEM design integration with the MK6 system. The D4720-001-02 is designed around the MK6 wiring standard — cable entry, terminal layout, and enclosure specification are all matched to the MK6 installation requirements. A generic junction box used in its place may accommodate the cables physically but introduces uncertainty about terminal compatibility, screening continuity, and environmental protection — uncertainties that have no place in the wiring infrastructure of a SOLAS-required crankcase explosion protection system.
Key Features
2-Input to 14-Input Configuration Range
The D4720-001-02 junction box is available in a range of input configurations — from 2-input through to 14-input — allowing the correct junction box size to be specified for the number of detector heads being connected at each installation point. For vessels with large main engines requiring many detector head connections, a single 14-input junction box can consolidate all detector head cables in one enclosure. For smaller auxiliary engines or installations with fewer detector points, a smaller input configuration keeps the installation tidy without unnecessary enclosure size. The correct input count should be confirmed against the number of MK6 detector heads being connected before ordering.
OEM Part Reference — D4720-001-02
The junction box is supplied under Graviner OEM part number D4720-001-02 — the manufacturer’s own part reference for the MK6 junction box component. For a wiring infrastructure component on a safety-critical crankcase protection system, OEM part reference sourcing confirms that the junction box is the correct specification for the MK6 installation — with the correct terminal layout, cable entry configuration, and enclosure specification to integrate cleanly with the MK6 detector head wiring and control unit connection architecture.
Engine Room-Rated Enclosure
The junction box enclosure is rated for the marine engine room environment — designed to protect the internal wiring connections from the heat, moisture, vibration, and contamination that characterise the engine room spaces where Graviner MK6 systems are installed. For an electrical connection enclosure housing the detector head signal cables for a safety-critical OMD system, environmental protection of the internal connections is a fundamental requirement. An enclosure that does not adequately protect its internal terminals in the engine room environment will develop connection integrity issues over time — degrading the reliability of the MK6 detector signal paths in exactly the environment where those signals need to be most reliable.
Consolidates Detector Head Wiring at a Single Connection Point
On MK6 installations with multiple detector heads distributed across a large engine, the junction box consolidates all detector head cable connections at a single, accessible enclosure — simplifying the MK6 system wiring layout, reducing the number of individual cable runs back to the control unit, and providing a single point of access for detector head connection inspection and maintenance. This consolidation is particularly valuable during drydock maintenance, when individual detector head cables may need to be disconnected and reconnected as part of engine maintenance work in the vicinity of the detector installation points.
Available in New and Refurbished Condition
The D4720-001-02 junction box is available in both new and refurbished condition. New condition provides factory-specification supply for new MK6 installations or junction box replacements where new condition is the required maintenance standard. Refurbished condition — inspected and verified before supply — provides a cost-effective option for vessels replacing a failed or damaged junction box on a long-service MK6 installation where the overall system is functioning correctly and a tested refurbished enclosure meets the procurement requirement.
Technical Specifications
Manufacturer: Kidde Graviner
Part Number: D4720-001-02
Description: MK6 Oil Mist Detector Junction Box
Compatible System: Graviner MK6 Oil Mist Detector
Input Range: 2-input to 14-input (specify required input count on order)
Application: Detector head cable consolidation and connection enclosure for MK6 system installations
Category: Oil Mist Detector Accessories / System Components
Condition: New and Refurbished (both available)
Benefits
Clean, protected detector head connections across the full MK6 installation. Unprotected or poorly managed detector head cable connections in the engine room environment are a source of progressive connection degradation — loose terminals, moisture ingress, and vibration-induced contact issues that develop gradually and may not manifest as a clear fault until the system fails to respond during an actual oil mist event. The D4720-001-02 junction box provides the protected, organised connection point that keeps detector head connections reliable throughout the service life of the MK6 installation.
Correct input configuration for any MK6 installation size. The availability of the D4720-001-02 across a range of input configurations — from 2-input to 14-input — means the junction box can be specified to match the exact number of detector heads at each connection point, without over-sizing the enclosure or requiring multiple smaller enclosures where a single correctly-sized unit is the neater solution.
Simplifies MK6 system maintenance and detector head access during engine overhauls. With all detector head cables terminated at a centralised junction box, disconnecting and reconnecting detector heads during main engine or auxiliary machinery maintenance is a straightforward enclosure-access task rather than a cable-tracing exercise through the engine room. For chief engineers and maintenance teams managing engine room maintenance schedules, this simplification has a real impact on the time required to complete detector head-adjacent maintenance tasks correctly.
OEM specification maintains MK6 system integrity and supports survey documentation. Using the manufacturer-referenced D4720-001-02 junction box in the MK6 installation — rather than a generic alternative — maintains the system’s OEM wiring infrastructure and provides the documentary reference required for accurate survey and maintenance records. For vessels presenting the MK6 system for class survey, being able to reference OEM component part numbers across the system installation is the expected documentation standard.
New and refurbished options support flexible procurement across different vessel situations. Whether the requirement is for a new junction box for a new MK6 installation or a replacement for a failed enclosure on a long-service system, both new and refurbished condition options are available — ensuring the correct component can be sourced against the specific procurement requirements of the situation.
Who It’s For
The Marine Engineer Overseeing MK6 Installation or Junction Box Replacement on Board
The junction box on your MK6 installation has been damaged during engine room maintenance work, or the existing enclosure is showing signs of environmental degradation — corroded terminals, damaged cable entries, or an enclosure that no longer provides adequate protection for the detector head connections inside. You need the correct OEM replacement — the D4720-001-02 in the correct input configuration for the number of detector heads connected — to restore a clean, protected wiring connection point for the MK6 detector head cables before the system is presented for the next class survey.
The Marine Equipment Installer or MK6 System Commissioning Engineer
You are installing a Graviner MK6 oil mist detection system on a new vessel, or installing additional MK6 detector heads on an existing installation to extend coverage to additional engine room machinery. The D4720-001-02 junction box — specified in the correct input configuration for the number of detector heads being connected — is the OEM wiring component that completes the installation to the manufacturer’s specification, with a clean, rated enclosure for the detector head cable connections that will be relied upon throughout the system’s service life.
The Fleet Technical Superintendent Managing MK6 Infrastructure Maintenance
You manage the planned maintenance programme for a fleet with Graviner MK6 installations across multiple vessels. Junction box condition is part of the broader MK6 system infrastructure assessment you carry out during drydocking periods — enclosures that have accumulated years of engine room service may need replacement as part of a comprehensive MK6 system overhaul. Provisioning D4720-001-02 junction boxes in the correct input configurations for your fleet’s MK6 installations ensures the infrastructure maintenance component of the MK6 overhaul can be completed without procurement delays during the drydock window.
Possible Applications
- New MK6 oil mist detector system installation — Junction box supply for new Graviner MK6 installations on vessels under construction or undergoing OMD system installation, providing the OEM wiring connection enclosure for detector head cable consolidation
- MK6 detector head addition and system expansion — Junction box supply for MK6 system expansions where additional detector heads are being added to cover additional engine room machinery, requiring a new or larger-input junction box at the connection point
- Junction box replacement following damage or environmental degradation — Replacement of a failed, physically damaged, or environmentally degraded junction box on an existing MK6 installation, restoring the protected detector head connection enclosure to operational condition
- Drydock MK6 system infrastructure overhaul — Junction box replacement as part of a comprehensive MK6 system maintenance programme during scheduled drydocking, ensuring all system infrastructure components are in serviceable condition for the next class period
- Main engine and auxiliary engine OMD installations — Junction box application across both main propulsion engine MK6 installations and auxiliary machinery OMD coverage, with input configuration selected to match the detector head count at each installation point
- Pre-survey MK6 system infrastructure restoration — Junction box replacement carried out ahead of class renewal surveys or port state control inspections, ensuring the MK6 system wiring infrastructure presents in serviceable condition consistent with a well-maintained safety system
- Vessel acquisition and MK6 system recommissioning — Junction box inspection and replacement as part of a full MK6 system condition assessment following vessel purchase or change of management, ensuring the wiring infrastructure meets the new operator’s maintenance standard
- Marine spare parts distributors and MK6 service companies — Stocked as a Graviner MK6 system component for supply to vessels, ship managers, and MK6 installation and service companies requiring the D4720-001-02 at short notice
Trust and Certifications
Kidde Graviner — OEM Manufacturer of the MK6 Oil Mist Detection System
Graviner, a Kidde brand, is the manufacturer of the MK6 oil mist detection system — one of the most widely installed crankcase explosion protection systems in the commercial marine fleet. The D4720-001-02 junction box is an OEM system component, designed and specified by Graviner as part of the MK6 installation infrastructure. Sourcing the junction box under the Graviner OEM part number provides the specification assurance that the component is correct for the MK6 installation — not a generic alternative that may introduce compatibility or protection uncertainties in the wiring infrastructure of a SOLAS-required safety system.
SOLAS Chapter II-1 — Crankcase Explosion Protection Infrastructure
The Graviner MK6 system’s compliance with SOLAS Chapter II-1 crankcase explosion protection requirements depends on the entire system — detection, processing, alarming, and the wiring infrastructure that connects them — being maintained in a serviceable condition. A junction box that does not adequately protect its internal connections in the engine room environment compromises the reliability of the detector head signal paths, and with them, the reliability of the system’s ability to detect and alarm on a developing oil mist event. Maintaining the MK6 wiring infrastructure with OEM components is the correct standard for a SOLAS-required safety system.
Classification Society Type Approval — Graviner MK6
The Graviner MK6 carries type approval from major classification societies including Lloyd’s Register, DNV, Bureau Veritas, ClassNK, and ABS — covering the system design as a complete installation including its wiring infrastructure components. Using OEM-referenced wiring components, including the D4720-001-02 junction box, is consistent with maintaining the MK6 installation in its type-approved configuration and supports the documentation standard expected during periodic class surveys of the vessel’s crankcase protection system.
Supplied by Alright Engineering Solutions
The Graviner MK6 Junction Box D4720-001-02 is supplied through Alright Engineering Solutions Pte. Ltd., a Singapore-based authorised distributor of marine safety and gas detection equipment. Both new and refurbished condition stock is available in multiple input configurations; contact our team to specify the required input count, confirm current availability, and request a formal quotation for your vessel or fleet requirement.
Accessories and Variants
Junction Box Input Configurations — 2-Input to 14-Input
The D4720-001-02 is available in input configurations from 2-input through to 14-input. The correct configuration is determined by the number of MK6 detector heads being connected at each junction box installation point. Please specify the required input count when requesting a quotation — Alright Engineering Solutions can advise on input configuration selection if the detector head count for your installation requires clarification.
Graviner MK6 Detector Heads
For MK6 installations requiring new or replacement detector heads alongside the junction box — whether for a new installation, a system expansion, or a detector head replacement programme — Alright Engineering Solutions can assist with sourcing Graviner MK6 detector head components. Contact our team with your MK6 detector head part references and requirements for availability and quotation.
Graviner MK6 LCD Display — Part No. 43785-K120
For comprehensive MK6 system maintenance covering both infrastructure components and control unit spare parts, Alright Engineering Solutions stocks the 43785-K120 latest revised LCD display for the MK6 control unit alongside the D4720-001-02 junction box — enabling a combined infrastructure and control unit maintenance procurement in a single order.
Graviner MK6 Commissioning Kit — Part No. D9221-026
Following junction box replacement or MK6 system re-wiring, a full system functional test and recommissioning using the Graviner D9221-026 commissioning kit confirms that all detector head connections are correctly established through the new junction box and that the MK6 system is responding correctly across all channels — providing the post-maintenance functional verification required for survey documentation.
Additional Graviner MK6 Spare Parts
Alright Engineering Solutions can assist with sourcing additional Graviner MK6 system components alongside the D4720-001-02 junction box — EEPROM 44782-K182, EPROM P57100-113, membrane function key front 39155-K047, and other MK6 system spare parts. Contact our team with your complete MK6 requirements for a combined availability check and quotation.
Get in Touch
If you need to source the Graviner MK6 Junction Box D4720-001-02 — in the correct input configuration for your installation, in new or refurbished condition — contact Alright Engineering Solutions to confirm current stock availability and request a formal quotation.
Please specify the required input configuration (2-input to 14-input) when enquiring. Our team can assist with configuration selection if required, and can combine the junction box with other Graviner MK6 spare parts in a single procurement.
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