Quick answer
Replace your Sea Dragon light's O-rings at least once a year or whenever you notice cracks, debris, or compression. Use a genuine SeaLife O-ring set matched to your model.
Why O-ring condition matters
A damaged or dirty O-ring is the most common cause of underwater light flooding. Even a single grain of sand or a small nick can break the seal at depth. Regular replacement is cheap insurance compared to a flooded light head.
Choosing the right replacement set
SeaLife sells O-ring sets specific to each light series. The set for the Sea Dragon 5000+ Photo-Video Light contains two O-rings and costs USD 7.40. For older Sea Dragon lights in the 1200-3000 lumen range, a separate set is available for USD 6.40. Using the correct set ensures proper fit and material compatibility.
Step-by-step replacement guide
- Remove the old O-ring: Unscrew the light head or battery cap where the O-ring sits. Use a plastic O-ring pick or your fingernail to gently lift the old ring out. Do not use metal tools that could scratch the sealing surface. Common mistake: using a screwdriver or knife that gouges the groove.
- Clean the groove and sealing face: Wipe the groove and the flat sealing surface with a lint-free cloth and isopropyl alcohol. Remove all old grease, grit, and salt residue. Let dry completely. Checkpoint: any leftover debris will prevent the new O-ring from seating evenly.
- Apply a thin layer of silicone grease: Place a small dab of silicone-based O-ring grease on your fingertip and run it around the new O-ring. Do not over-grease — excess grease can trap debris and attract dirt. Common mistake: using petroleum-based grease that can degrade the O-ring material.
- Install the new O-ring: Gently press the greased O-ring into the groove, working it around evenly. Ensure it is not twisted or pinched. Run your finger around the ring to check it sits flush. Checkpoint: a twisted O-ring will not seal — look for any visible kinks before reassembly.
- Reassemble and test the seal: Screw the light head or cap back on hand-tight. Do not overtighten. Before your next dive, submerge the light in fresh water and check for bubbles. If bubbles appear, disassemble and recheck the O-ring. Common mistake: overtightening compresses the O-ring unevenly and can cause premature failure.
Recommended O-ring sets
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Replacement O-ring set for (SL680) Sea Dragon 5000+ Photo-Video Light: Replacement O-ring set for Sea Dragon 5000+ Photo-Video Light; contains two O-rings. This set is exactly what you need for the 5000+ model — buying generic O-rings risks an improper seal.
Replacement O-ring set for (SL680) Sea Dragon 5000+ Photo-Video Light
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O-Ring Set (2) for Sea Dragon 1200-3000 Lumen Lights: Replacement O-ring set for Sea Dragon 1200-3000 Lumen Lights. If you own an older Sea Dragon light in this range, this set matches the groove dimensions and material.
O-Ring Set (2) for Sea Dragon 1200-3000 Lumen Lights
