Raytech Gel Box Line | Pre-Filled Gel Boxes for Connectors

Pre-Filled Gel Boxes for Electrical Connectors

Protect the Connector You Already Use

Gel Box Line adds pre-filled gel protection around common electrical connectors and terminal blocks without changing the connection system you already use.

Make the connection, choose the Gel Box that fits it, place the completed connection inside and close the housing. Soft G4J insulating gel conforms around the connector and conductors while the enclosure keeps the gel contained around the connection.

No measuring, mixing or pouring required.

IPX8 tested. Fully submersible. Suitable for underground use.

Why Gel Box Line

Pre-Filled Protection, Ready to Install

No Mixing or Pouring

The enclosure arrives pre-filled with insulating gel and ready for the completed connection.

Use Your Existing Connector

Protect common wire connectors and terminal blocks without switching to a proprietary connection system.

IPX8 Water Protection

Fully submersible and suitable for underground electrical connections.

Soft Insulating Gel

G4J remains extremely soft while providing dielectric strength greater than 20 kV/mm.

Very Low Water Absorption

Less than 0.05% water absorption after 30 days of immersion.

UV Resistant

Suitable for installations where the enclosure may also be exposed to sunlight.

Size Guide

Which Gel Box Fits Your Connection?

Five enclosure sizes cover a range of common terminal blocks and wire connector configurations.

Choose the box around the physical size and layout of the completed connection. Connector dimensions can vary, so the finished connector and conductor arrangement should fit comfortably inside the enclosure.

Isaac

30 × 27 × 23 mm | 1.18 × 1.06 × 0.91 in

Compact protection for smaller terminal blocks and wire connectors.

Common Configurations

2 × 2.5 mm² • 2 × 2.5 mm² lever connector • 3 × 2.5 mm² • 2 × 4 mm² • 3 × 4 mm²

Available Packs

4 pc Blister • 30 pc Box • 50 pc Multipack

Pascal

36 × 37 × 26 mm | 1.42 × 1.46 × 1.02 in

A wider enclosure for larger connectors and grouped compact connections.

Common Configurations

2 × 4 mm² • 3 × 2.5 mm² • 3 × 1.5 mm² • 2 + 2 × 2.5 mm² • 5 × 2.5 mm²

Available Packs

2 pc Blister • 15 pc Box • 25 pc Multipack

Watt

30 × 42 × 26 mm | 1.18 × 1.65 × 1.02 in

A longer enclosure for elongated connectors and multi-connector layouts.

Common Configurations

3 × 2.5 mm² • 2 + 2 × 2.5 mm² • 5 × 2.5 mm² • 2 + 2 × 4 mm² • 5 × 4 mm²

Available Packs

2 pc Blister • 15 pc Box • 25 pc Multipack

Joule

33 × 52 × 26 mm | 1.30 × 2.05 × 1.02 in

Extra length for layouts using several individual wire connectors.

Common Configurations

2 + 2 + 2 × 2.5 mm² • 2 + 2 + 2 × 4 mm²

Available Packs

1 pc Blister • 20 pc Multipack

Kelvin

52 × 53 × 29 mm | 2.05 × 2.09 × 1.14 in

The largest Gel Box Line enclosure for larger terminal-block connections.

Common Configurations

3 × 6 mm² terminal-style connector arrangements

Available Packs

1 pc Blister • 9 pc Box • 20 pc Multipack

Choose by the completed connection, not wire gauge alone. The connector determines conductor compatibility. Select the Gel Box based on the physical size and arrangement of the finished connection.

Installation

Simple 3-Step Installation

Make the Connection

Terminate the conductors using the appropriate connector for the wire and application.

Select the Enclosure

Choose the Gel Box that fits the completed connector and conductor arrangement.

Position and Close

Place the connection inside the pre-filled enclosure and fully close the housing.

G4J Insulating Gel

Soft Gel That Conforms Around the Connection

Gel Box Line is pre-filled with clear G4J cross-linked polymeric gel. At 0 Shore 00, the gel remains extremely soft and conforms closely around the connector and conductors instead of curing into a rigid encapsulant.

G4J provides dielectric strength greater than 20 kV/mm and water absorption below 0.05% after 30 days of immersion. The gel is halogen-free and is a UL Recognized Component.

Environmental Protection

For Wet, Submerged and Underground Connections

Gel Box Line combines an IPX8-tested enclosure with soft insulating gel surrounding the connection. It is suitable for submerged, underground and other water-exposed electrical installations.

Salt water and chlorine environments have no adverse effect on the cross-linked G4J gel under the specified exposure conditions.

Technical Details

Technical Specifications

Product Type Pre-filled gel box for electrical connectors

Protection IPX8 officially tested

Submersible Yes

Underground Use Yes

Wire Types Rigid or flexible insulated wires

Gel G4J cross-linked polymeric gel

Gel Hardness 0 Shore 00

Dielectric Strength >20 kV/mm

Water Absorption <0.05% after 30 days immersion

Thermal Conductivity Approx. 0.2 W/mK

Gel Flammability UL 94 HB

Gel UL Status UL Recognized Component

Halogen-Free Gel Yes

Finished Accessory Working Temperature 90°C / 194°F

Installation Temperature -40°C to +50°C / -40°F to +122°F

UV Resistant Yes

G4J gel has a continuous working-temperature range of -60°C to +150°C. The complete Gel Box Line accessory has a working temperature of 90°C / 194°F.

UL Recognition applies to the G4J gel component, not to the complete Gel Box Line assembly.

Gel Box Line

Protection for the Connector You Already Use

Choose the enclosure that fits the completed connection, place it inside the pre-filled Gel Box and close the housing.

Connector not included.

Shipping information

If you have time-sensitive requirements, we recommend selecting a UPS service at checkout. UPS generally offers more consistent transit performance, while USPS transit times can vary.

Orders are processed within 1–2 business days, with most orders placed before 2 PM EST shipping the same day. We offer a full range of USPS and UPS shipping options, including expedited and next-day delivery for urgent requirements.

Product Selection Guide

Choose the Right Raytech Product

Use this guide to compare Raytech waterproof electrical protection products by application, serviceability, and installation method.

General dielectric gel

Magic Gel

Best for: general waterproof potting and electrical insulation.

Choose Magic Gel when you need a dielectric gel for filling an enclosure, junction box, or electrical connection while keeping future access possible.

IP68 System Re-enterable Low Viscosity

View Magic Gel

Reusable gel protection

Magic Power Gel

Best for: reusable waterproof protection.

Choose Magic Power Gel when future access and reusability matter. It is a strong option when the connection may need to be opened and resealed later.

IP68 System Re-enterable Reusable Self-Amalgamating

View Magic Power Gel

Gel-rubber protection

Techno Gelgum

Best for: vibration damping and mechanical hold.

Choose Techno Gelgum when the connection is exposed to movement, vibration, mechanical stress, or demanding submerged conditions. Even suitable for high depths under water.

IP68 System Re-enterable Gel-Rubber Vibration Damper High-Depth Use

View Techno Gelgum

Flexible rubber compound

Magic Rubber

Best for: stronger mechanical structure.

Choose Magic Rubber when you need more structure than a soft gel, but do not want to permanently encapsulate the connection with hard epoxy.

IP68 System Re-enterable Flexible Rubber Mechanical Support

View Magic Rubber

Fast-curing dielectric gel

Magic Gel Sprint

Best for: fast curing waterproof potting and electrical insulation.

Choose Magic Gel Sprint when you need a re-enterable dielectric gel with a faster curing time for quicker installations or faster return to service.

IP68 System Re-enterable Fast Cure Low Viscosity

View Magic Gel Sprint

Transparent / UV-resistant gel

Ray Gel

Best for: transparent or UV-resistant waterproof protection.

Choose Ray Gel when you need a low-viscosity dielectric gel with transparent or UV-resistant protection for electrical connections, junction boxes, or installations exposed to UV.

IP68 System Transparent UV Resistant Low Viscosity

View Ray Gel

Cartridge gel

Wonder Gel

Best for: overhead and hard-to-reach junction boxes.

Choose Wonder Gel when you need a ready-to-use cartridge gel for overhead, vertical, or hard-to-reach junction boxes where pouring is difficult or not practical.

IP68 Cartridge No Mixing Ready-to-Use

View Wonder Gel

Raytech prefilled gel box waterproof wire connector protection

Prefilled connector boxes

Prefilled Gel Boxes

Best for: wire connectors and terminal blocks.

Choose prefilled gel boxes when you want a ready-to-use solution for protecting wire connectors or terminal blocks without mixing, pouring, or curing.

IPX8 Prefilled No Mixing Ready-to-Use

View Gel Boxes

Gel Box Line – Pre-Filled Gel Boxes for Electrical Connectors

Protect the Connector You Already Use