Also see part #79101600Z
The Super-Pro O-170-9 is a Silicone Pool Light Lens Gasket. A gasket is a rubber piece used to create a seal between two surfaces. It is a genuine Super-Pro product.
Pentair-American 79101600 AmerLite O-ring
Price: $12.74
Light Niche Repair ring, Swimquip 6 in.
Price: $131.21
Lens Gasket 8-3/8 inch Pentair Amerlite
Price: $46.08
O-ring kit, Hayward Sealed beam lights
Price: $100.20
Light Lens Gasket, Hayward, Starlite II, High Temp
Price: $40.21