AquaStar Pool Products Full Circle FCHV103 20" Suction Cover with One-Port Sump and Hydrostatic Valve Light Gray for single or multiple drain use. A disposable plaster shield is included to prevent debris from entering sump and to retain shape during pool finish. Waterstop around edges prevents water leaks. The unique circle design is filled with plaster/pebble to blend into the pool finish. Manufactured from superior UV-resistant PVC.