Pentair 4" SpaBrite Underwater Spa Light Lens Gasket | 79108500Z

The Pentair 79108500Z Spa Light Lens Gasket is a genuine OEM replacement sealing gasket designed for compatible Pentair SpaBrite underwater spa lights with a 4-inch diameter glass lens. This off-white gasket helps create a watertight seal between the glass lens and light housing, protecting internal electrical components from pool and spa water.

Manufactured to Pentair's original equipment specifications, the 79108500Z is an essential replacement component when servicing compatible spa lights, replacing damaged lenses, or repairing fixtures with deteriorated lens seals.

Product Features

• Genuine Pentair OEM: Original manufacturer replacement lens gasket.
• 4-Inch Lens Compatibility: Designed for compatible underwater spa lights using a 4-inch diameter lens.
• Watertight Sealing: Helps prevent water from entering the light housing when correctly installed.
• Off-White Finish: Original Pentair SpaBrite gasket color.
• Replacement Light Seal: Ideal for replacing compressed, cracked, damaged, or deteriorated gaskets.
• OEM Fitment: Manufactured for the specified Pentair underwater lighting assemblies.
• Light Maintenance Component: Recommended for replacement when opening and reassembling compatible spa light fixtures.

Product Specifications

• Manufacturer: Pentair
• Manufacturer Part Number: 79108500Z
• Previous Part Number: 79108500
• Product Type: Underwater Spa Light Lens Gasket
• Compatible Lens Diameter: 4 Inches
• Color: Off-White
• Primary Application: Pentair SpaBrite Underwater Spa Lights
• Application: Pool and Spa Underwater Lighting
• UPC: 788379886844
• Quantity: 1 Lens Gasket

Compatible Pentair Underwater Lights

• Pentair SpaBrite Underwater Spa Lights requiring part number 79108500Z
• American Products SpaBrite Spa Lights using the same 4-inch lens gasket
• Other compatible Pentair spa light assemblies specifically calling for 79108500 or 79108500Z

Compatibility Note: Pentair AquaLight fixtures may require the separate 79108600 silicone lens gasket. Always verify the exact lighting fixture model and original gasket number before ordering.

Why Replace Your Spa Light Lens Gasket?

The lens gasket is an important sealing component in underwater spa lighting. Over time, gaskets can become compressed, brittle, cracked, or damaged by heat, water chemistry, and repeated servicing.

A deteriorated gasket can allow water to enter the light housing, potentially causing corrosion, electrical damage, or complete light failure.

Common Signs of a Worn Lens Gasket

• Water or moisture visible inside the light housing
• Condensation or fogging behind the glass lens
• Cracked, flattened, or hardened gasket material
• Water intrusion following a bulb or lens replacement
• Visible deterioration around the lens sealing surface
• Damaged or improperly seated original gasket

Installation and Replacement

1. Turn off electrical power to the underwater spa light at the circuit breaker.
2. Verify that the lighting circuit is completely de-energized.
3. Remove the light fixture from its niche according to Pentair's service instructions.
4. Inspect the fixture housing, lens, face ring, and retaining hardware.
5. Remove the original lens gasket and clean the sealing surfaces.
6. Confirm that the replacement Pentair 79108500Z gasket matches the specified fixture and lens.
7. Install the new gasket in the proper position without twisting or pinching it.
8. Reassemble the fixture using the manufacturer's specified procedure and retaining hardware.
9. Complete the required inspection and watertightness checks before returning the light to service.
10. Have a qualified professional verify safe operation before energizing the fixture.

Installation Recommendation: Always install the correct new lens gasket when servicing a compatible underwater spa light. Reusing an old compressed gasket can increase the risk of water intrusion.

Related Pentair Spa Light Replacement Parts

Complete your underwater spa light repair with these related replacement parts available from Aqua Pool Supply.

• Aladdin O-344 – Silicone Spa Light Lens Gasket – Aftermarket replacement option cross-referenced to Pentair 79108500Z for compatible 4-inch spa light lens applications.
• Pentair 79104800Z – Pilot Screw with Captive Gum Washer – Genuine replacement brass screw and washer used to secure the face ring of compatible Pentair underwater lights.

Pentair SpaBrite & AquaLight Replacement Parts Diagram

Looking for additional replacement components? Visit our Pentair SpaBrite & AquaLight Light Replacement Parts Diagram to identify compatible glass lenses, face rings, retaining clamps, screws, and other lighting components.

Genuine Pentair Spa Light Replacement Parts

Using the correct replacement gasket is essential for maintaining the integrity of an underwater light fixture. Genuine Pentair components are designed to match the specified original equipment, helping ensure proper fit during fixture assembly.

Package Includes: One (1) genuine Pentair 79108500Z Off-White 4-Inch Spa Light Lens Gasket.

Important: This product includes the lens gasket only. Glass lens, bulb, face ring, wire clamp, pilot screw, and complete underwater light fixture are sold separately.

Safety: Underwater lighting involves serious electrical hazards. Never operate a fixture containing water or showing signs of compromised sealing. All underwater spa light servicing should be performed by a qualified professional following Pentair instructions and applicable electrical codes.