Regal 53 SC Owner's Manual page 484

Storage & Winterization
SEA CHEST SELF-CLEANING SYSTEM
In freezing climates drain the pump and fi lter to winterize
since the pump or fi lter could be damaged.
To drain, remove the black drain plug on the side of the
pump/fi lter unit, and disconnect the hoses.
Replace and tighten the drain plug and or hose when
draining is complete.
Another method of winterizing could be running ethylene
glycol through the system and all connected components.
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