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Available in three sizes to fit any GROCO ARG Strainer, FLUSHcap® makes flushing your raw water cooled equipment a snap. Temporarily replacing your existing strainer cap with a FLUSHcap® will allow you to easily connect a Port-O-Flush Jr.® or garden hose to your system. Use FLUSHcap® to flush your raw water cooled equipment with Barnacle Buster®, fresh water, or to aid in winterizing your system.NOTE: Not intended to replace your existing strainer cap, for flushing use only.