Available in three sizes to fit any GROCO ARG Strainer, TRAC's FLUSHcaps make flushing your raw water cooled equipment a snap! FLUSHcaps make descaling with Barnacle Buster, fresh water flushing, and winterizing your raw water cooled equipment a snap! No Need to constantly remove your hoses to gain access to your strainer. Temporarily replacing your GROCO ARG Strainer Cap with a TRAC FLUSHcap allows you to effortlessly flush your strainer and adjoining system.