In brief: Pentair 8-hole gasket for small vinyl pool light niche. Pentair part number 79200300.
Water behind the liner around the light?
In a vinyl pool, the light niche passes through the wall. The seal between the liner and the niche relies entirely on a flat gasket and a multi-hole clamping ring.
When this gasket hardens or tears, water gets behind the liner. You may notice a bubble forming around the niche, the liner peeling away locally, or the water level slowly dropping for no other apparent reason.
This gasket must be replaced every time the liner is replaced. It is also the first part to check when a leak is suspected around the light.
Official Pentair specifications
| Part number |
79200300 |
| Number of holes |
8 |
| Application |
Small vinyl pool light niche |
| Genuine part |
Yes, Pentair part |
Frequently asked questions
Should it be replaced when the liner is replaced?
Yes, every time. The gasket has taken the shape of the old liner and will no longer seal against the new one. It’s a false economy that can end up costing a lot in the long run.
How should I tighten the ring?
Tighten it gradually in a crisscross pattern, like the lug nuts on a wheel. Uneven tightening can wrinkle the gasket and create a leak path.
8 or 10 holes?
Count the holes in your existing ring before ordering. The 79200300 is the 8-hole model for a small niche. There are also 10-hole configurations.
Service on the North Shore
Piscines Geyser stocks Pentair parts in Blainville and serves the Laurentians. Send us a photo of your installation if you’re unsure which part fits; we’ll confirm before shipping.
