Pentair Large Stainless Steel Niches for Concrete 1" Top Hub | 78210500

Pentair Large Stainless Steel Pool Light Niche for Concrete Pools, 1" Top Hub (10-Hole Pattern) | 78210500

The Pentair 78210500 is a large stainless steel underwater light niche designed for concrete (gunite/plaster) pool and spa installations. This niche provides a durable, corrosion-resistant housing for compatible large-format niche-style pool lights and includes a 1" top hub for conduit routing up to a junction box.

Key Features

• Concrete pool installation: built for setting into gunite/plaster pools and spas.
• Large niche format: for compatible large pool/spa lights using the standard 10-hole mounting pattern.
• 1" top hub: top-mounted hub for conduit/cord routing and installation layout flexibility.
• Stainless steel housing: long-lasting, corrosion-resistant niche body.
• Brass hub/fittings (typical): robust conduit connection components.
• Bonding provisions: internal and external bonding/grounding lugs to support code-compliant bonding.
• OEM Pentair niche: intended for use with compatible Pentair/American Products large niche-style lights.

Compatibility

• Pool Type: Concrete (gunite/plaster) pools and spas
• Light Type: Large niche-style underwater lights using a 10-hole pattern
• Tip: Confirm your existing niche pattern (10-hole), niche size (large), and hub location/size (1" top hub) before ordering—large niche parts are not interchangeable with small niche or nicheless light systems.

Specifications

• Brand: Pentair
• Part Number: 78210500
• Niche Type: Large stainless steel niche
• Installation: Concrete pools/spas
• Mounting Pattern: Standard 10-hole
• Hub Location: Top
• Hub Size: 1"
• Bonding Lugs: Internal and external
• Quantity: Sold individually

Common Reasons to Replace

• Corroded or damaged niche during renovation or major lighting upgrade
• Stripped or damaged hub/conduit connection
• Restoring proper bonding/grounding provisions on an older installation
• Converting to a compatible large niche light system requiring a large stainless niche

Installation Notes

• Underwater lighting and bonding/grounding work should be performed by a qualified pool professional/electrician per local code.
• Plan conduit routing from the 1" top hub to a listed pool light junction box in the required location.
• Confirm the niche is set square and at the correct elevation before gunite/plaster—misalignment can affect face ring fit and gasket sealing.
• Use compatible large-light sealing components (lens gasket, face ring/clamp hardware) specific to your light model.

Related Products

• Pool Light Junction Box (78310500)
• Large Light Stainless Face Ring (79110600)
• Large Light Lens Gasket (79101600Z)
• Large Niche Plaster Ring (79211600Z)
• 1" Conduit & Fittings for Pool Lights
• Large Pool Light Parts

Maintenance Tips

• Any time a light is opened for service, replace the lens gasket and ensure clamping hardware tightens evenly.
• Keep bonding connections clean and secure—corrosion at bonding points can create reliability and safety issues.
• Maintain balanced water chemistry to reduce corrosion risk on metal components over time.
• If you see fogging/water behind the lens or repeated GFCI trips, shut off power and have the system inspected immediately.