The Johnson 57151 Ultima Multiple Port Shower Sump is designed to meet the higher demands from today?s boating industry where more equipment is used. 1000 GPH Multi Port Shower Pump with switch. Featuring Ultima Switch technology, this proven shower sump design just got better than before. Designed to work flawlessly in harsh environments, the Ultima Switch ignores dirt, grease, hair, detergents and other nasty contaminants that enter the typical shower sump. A great upgrade!