The Pool Tool Test Hook [Main Drain Cover] is a service tool used for testing and checking main drain cover security. Main drain covers are critical safety components, and having the right test tool helps technicians inspect cover attachment and condition during maintenance visits.This Pool Tool Inc. test hook is built for practical pool service workflows. It allows maintenance professionals to apply a controlled check to compatible drain covers, helping identify loose, damaged, or improperly seated covers that may need further attention. Test hook for checking main drain cover security Useful during pool safety inspections and maintenance Helps identify loose or questionable drain cover installations Practical service tool for technicians and facility operators Pool Tool part 122 for accurate ordering