The purpose of a gasket in a pool light fixture is to seal the light bulb from the pool water inside the light fixture. Many bulbs fail because the gasket deteriorates from the heat and harsh pool chemicals. Some light bulbs are expensive - in the range of $300-$400, so you might think about replacing the pool light gasket every 3 years or so. This guide provides step-by-step instructions for replacing a typical pool light gasket.
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