Thru-HullSeaLite

®

150W-HID Cleaning the Backup Sealing O-Ring

The backup sealing O-ring forms a watertight junction where the light head is inserted into the thru-hull fitting. Having a watertight junction between the light head and the thru-hull fitting ensures that even if the front sapphire window is broken, water will be confined to the inside of the thru-hull fitting. It is a second layer of protection keeping water out of the vessel. The backup sealing O-ring should be inspected whenever the light head is removed from the thru-hull fitting. WARNING! The backup sealing O-ring should only be serviced when the light head and thru-hull fitting are cool enough to handle comfortably. If the light head and thru-hull fitting are hot from use, turn the light off and allow it to cool before proceeding. Servicing the O-ring while the light head is hot can result in burns. 1. It is not necessary to remove the light head from the thru-hull fitting to service the O-ring, but it may be desirable so that the light head can be moved to a more convenient location. If you plan to remove the light head from the thru-hull fitting, prepare a clean surface within reach of the wire attached to the light head. A pad made from several paper towels covering a dry, clean surface works well. Collect a small (1/8") flat blade screwdriver and some paper towels within easy reach of where you will work. You will also need a small amount of suitable grease, such as Dow Corning valve lubricant and sealant (DC-111), to coat the O-ring after it is cleaned. If the two vinyl caps that were originally supplied with the Thru-Hull SeaLite Caution! Do not remove the sealing O-ring by prying beneath it with a screwdriver or any sharp object. Instead, pinch the O-ring on two sides of the fitting with your thumb and finger, then slide your thumb and finger toward each other. This will create a loop in the O-ring that you can grab and use to remove the O-ring from its groove. Prying under the O-ring can damage it and prevent it from sealing when the light head is reassembled in the thru-hull fitting. 7. Inspect the sealing O-Ring for any damage or signs of debris. If the O-ring is damaged, contact your local distributor or DeepSea Power & Light for a replacement. If debris is present, remove the O-ring and clean it with a lint free cloth. Apply a thin coating of Dow Corning valve lubricant and sealant (DC- 111) and reinstall the O-ring onto the light head’s end cap. 8. Slide the light head retaining ring back into place on the end cap.
® are available, collect them as well. 2. Disconnect and lock out the power to the ballast.3. Unscrew the light head retaining ring. Doing so will disengage the sealing O-ring from the thru-hull fitting. 4. The O-ring can be serviced with the light head in place by sliding the light head about 1 inch out of the thru-hull fitting. If the light head is to be removed from the fitting, slide the light head out of the fitting and sailboat cover the reflector with the smaller of the two vinyl caps. If the vinyl cap is not available, a paper towel secured with a rubber band can also be used to keep the sailboat lamp and reflector from being contaminated. Set the light head aside on the clean surface and cover the open end of the thru-hull fitting with the larger vinyl cap, or a paper towel secured with a rubber band if the vinyl cap is not available. 5. Using the small screwdriver, remove the snap ring behind the end cap retaining ring. You will have to first move the snap ring from its groove up onto the end cap, then move the snap ring off of the end cap onto the light head wire. 6. Slide the retaining ring off of the light head end cap onto the wire. 22
Rev. B 8/13/07