Replacement O-ring set (SL35017) for the ReefMaster RM-4K Housing.

How to replace O-ring:

1. Lift and remove O-ring from their grooves using the O-ring removal tool.
2. Clean the O-ring grooves using a dampened, lint-free cotton cloth.
3. Apply thin film of SeaLife Silicone O-ring lube (item SL9807) to the new O-ring.
   Use fingertips to evenly spread the lube. Don’t stretch the O-ring.
4. Install new, lubed O-ring in their groove being careful not to twist the O-ring.
5. Check that O-ring is clean and evenly seated in its groove.