In our lineup of over 3100 genuine Hot Spring spa parts are all four designs of the Hot Spring brand of cover lifters. Some of these cover lifters or Retractable Cover Systems (RCS) are designed to attach to the spa and also to the Hot Spring cover. In 1996, all Hot Spring spa covers (Watkins) were equipped with hidden steel inserts embedded into the insulated foam cores. These inserts enabled some styles of Hot Spring cover lifters to attach directly into the edge of their spa covers. Mega beefy design!