IP68 Outdoor Waterproof Junction Box M16 M20 M25 2-Way – Outdoor Electrical Cable Connector

Description

IP68 Outdoor Waterproof Junction Box – M16/M20/M25 Cable Gland, 2-Way, Ø3.5–14mm Wire Range

An IP68-rated waterproof junction box for making permanent, weatherproof electrical cable connections in outdoor, underground, and wet-area installations. The gel-filled or compression-sealed interior encapsulates the cable connection, preventing moisture ingress even under continuous water immersion. M16, M20, and M25 cable gland entries accommodate a wide range of cable diameters (3.5–14mm OD), making this junction box suitable for garden lighting cables, outdoor power circuits, underground cable runs, and security camera power connections.

Key Specifications

IP Rating: IP68 — dust-tight + continuous water immersion (depth and duration per manufacturer spec)
Cable Entries: M16, M20, or M25 cable gland threads (select variant)
Cable Diameter Range: Ø3.5–6mm (M16), Ø6–10mm (M20), Ø10–14mm (M25)
Ways: 2-way (2 cable entries)
Sealing Method: Gel-filled or compression gland (variant dependent)
Housing Material: UV-stabilized polycarbonate or ABS
Current Rating: Up to 32A (verify per internal terminal block variant)
Voltage Rating: 450V AC
Operating Temperature: -40°C to +85°C

IP68 Junction Box Sealing Methods — Gel vs Compression Gland

Gel-filled (resin encapsulation): The cable connection is made inside the box, then the box is filled with silicone or polyurethane gel that encapsulates the connection. The gel conforms to irregular shapes and provides excellent long-term waterproofing. Cannot be reopened without destroying the seal — permanent installation only.
Compression gland: Cable glands compress a rubber seal around the cable OD when tightened. Reusable and reopenable for inspection or modification. IP68 rating depends on correct gland torque and cable OD matching the gland range. Preferred for installations requiring future access.

What Questions Does This Product Answer?

"Can I bury this junction box underground?" — Yes. IP68 rating covers continuous water immersion, making this box suitable for direct burial in soil. For permanent underground installations, use direct-burial rated cable and ensure the cable glands are correctly torqued. Place the box in a location accessible for future inspection if possible.
"What cable diameter fits an M20 cable gland?" — M20 cable glands typically accept cable OD of 6–10mm. For 2.5mm² twin-and-earth cable (approximately 9mm OD), M20 is the correct gland size. For 1.5mm² cable (approximately 7mm OD), M16 or M20 both work — use the smaller gland for a tighter seal.
"Do I need a junction box for outdoor cable connections?" — Yes. Exposed cable connections (twisted wires, wire nuts, or tape) are not suitable for outdoor use — moisture ingress causes corrosion, increased resistance, and potential shock hazard. All outdoor cable connections must be made in a weatherproof enclosure rated IP44 minimum (IP65 for exposed outdoor, IP68 for underground).
"Can I use this box for low-voltage garden lighting?" — Yes. IP68 junction boxes are ideal for 12V and 24V garden lighting cable connections, outdoor LED driver connections, and landscape lighting circuits. Verify the internal terminal block current rating matches your lighting load.

Typical Applications

Garden & landscape lighting: Underground cable joins, outdoor LED driver connections, pathway lighting circuits
Security cameras: Outdoor PoE cable connections, camera power supply joins, CCTV cable extensions
Outdoor power circuits: Garden socket feed cables, shed power connections, outdoor pump wiring
Underground cable runs: Direct-burial cable joins, conduit entry points, underground distribution points
Marine & pontoon: Deck lighting connections, underwater light wiring, bilge pump cable joins

Installation Notes

Strip cable insulation to the correct length — do not nick conductor insulation
Make connections inside the box before sealing — gel-filled boxes cannot be reopened
Tighten cable glands to the specified torque to achieve IP68 seal — hand-tight is insufficient
For underground installation, orient the box horizontally or with cable entries facing downward to prevent water pooling at the gland seals
Protect the circuit with an RCD/GFCI rated at 30mA for all outdoor and underground circuits