Marine general service pump is sometimes called marine GS marine pump for short. In fact, it is just a general name for the marine ballast pump, bilge pump, fire pump and so on. In another word, marine general service pump can be used as an instead of marine ballast pump, bilge pump, fire pump and so on, so it is called general service pump. 
SILI PUMP is a reputation marine general service pump supplier and manufacturer in China. Click the following s ested pump link to find a suitable model: marine GS pump.