Pentair 78310700 – Pool Light / Spa Light Junction Box (Polycarbonate Cover & Brass Base)
The Pentair 78310700 is a junction box designed for pool and spa lighting systems. It provides a waterproof, code-compliant enclosure where low-voltage wires from underwater lights are connected to the main power supply — making it an essential component for safe, reliable pool lighting installations or repairs.
Key Features
- Durable brass base and UV-resistant polycarbonate cover — built for long-term exposure to pool chemicals, water spray, and sunlight.
- Port configuration: ¾″ × 1″ × ¾″ inlets / outlets — fits standard conduit and flexible conduit fittings used in pool / spa light wiring.
- Comes with gasket, cover-screws, and built-in strain relief — ensures a watertight, electrically safe seal.
- Meets electrical-safety standards for pool lighting enclosures (suitable for installations requiring compliance with pool & spa wiring codes).
- Compact and weather-tight — ideal for retrofit jobs or replacing aging junction boxes during pool remodels or light upgrades.
Specifications
- Manufacturer: Pentair Pool & Spa
- Part Number: 78310700
- Type: Light junction box (for pool / spa underwater light wiring)
- Base Material: Brass (corrosion-resistant)
- Cover Material: Black polycarbonate (UV- and chemical-resistant)
- Ports: ¾″ × 1″ × ¾″ conduit ports
- Includes: Brass base, polycarbonate cover, gasket, cover screws, internal strain-relief fittings
- Typical Dimensions: ~6″ × 4″ × 4″ (box size) — suitable for most pool light wiring runs and splices
When & Why to Use
Use the 78310700 junction box when installing new underwater pool lights, replacing a cracked or leaking existing light junction box, or upgrading old components to meet current safety standards. A proper junction box helps protect wiring from water intrusion, keeps connections dry, and reduces the risk of electrical hazards — essential for pool-side lighting reliability and safety compliance.
Installation & Maintenance Tips
- Always de-energize and lock out power before servicing or installing the junction box.
- Use conduit fittings and PVC or flexible conduit appropriate for pool-side exposure; tighten ports with approved fittings to maintain waterproof seal.
- Ensure the cover gasket is clean and properly seated before tightening cover screws — replace gasket if cracked or degraded.
- Inspect box periodically for corrosion, cracking, or water intrusion — especially before pool opening or after winter. Replace if any part shows signs of deterioration.
