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.
CAUTION: Possible Electrical Shock or Electrocution: For your safety please use the necessary precautions before attempting to work with water and electricity. If you are unsure about how to tell if the power to your pool light is off, find someone that is familiar with electricity to ensure it is off before you start working with your pool light.
PURCHASE GASKET - You should order you light gasket ahead of time to have on hand for replacing the old one. If you already know the make and model of your pool light, go to our Light Parts page to find the proper gasket.
IDENTIFY POOL LIGHT - If you don't have any information about your pool light, check for an identification on the face ring and on the lens as manufacturers sometimes have part numbers or their name molded into the parts. In this case the manufacturer's name, American Products Company, can be seen on the lens.
IDENTIFY POOL LIGHT - If you don't see identification information on the outside of the light, you will most likely need to follow the steps below to remove the light from the pool wall. The manufacturer name, model number, voltage and wattage of pool lights are typically found on a sticker on the back of the light housing (usually where the cord of the light attaches to the housing).
UNSCREW LIGHT FIXTURE - Your first step in replacing the light bulb is to remove the pool light fixture from the niche in the pool wall. Most pool light fixtures are secured to the niche with a single screw at the top of the light. Remove this screw. If the pool light is just below the surface, you may be able to remove the screw by leaning over the pool deck. In this case I had to get in the pool with a snorkel and goggles.
DISASSEMBLE THE LIGHT FIXTURE - The older models have a series of brass retainer clips and screws around the perimeter of the light fixture to keep it together. Remove all the clips. Note: the newer models are held together with a unitension wire clamp with one bolt and nut. See Pentair Amerlite Pool Light for examples of both models.
REASSEMBLE LIGHT ASSEMBLY - Set the light housing (with lens and gasket) on top of the Face Assembly Ring. Reassemble the light housing assembly by screwing in the brass retaining clips. Alternately tighten the screws/clips to allow the gasket to seat properly - two on one side then two on the other side. Do not over tighten. Hand tighten only. If you find that the gasket is not fitting into the groove of the Face Assembly Ring, you might try stretching the gasket a little.
TEST BULB - Find a friend to watch the light while you briefly turn on the electricity. This is to confirm that the new bulb actually works. These lights are not made to be turned on out of the water, so this has to be a very quick check.