Feature/特征: 

Wet motor pump, low noise/屏蔽泵，噪音低 

There pre-selectable speed stages for power adjustment/可三檔調速 

Electrical connections possible on both sides of the terminal box/可從接線盒任意一側接線 

Terminal Box position: 3h ; 6h ; 9h ; 12h/接線盒可四方為旋轉，以適應各種安裝 

Application/應用: 

Hot water heating systems of all kinds/熱水采暖系統 

Industrial circulation systems/工業循環系統 

Cold water system and air-conditioning systems/冷水和空調系統 

Roof tank to water tap transfer(ST20/11 with fow switch)/屋頂水箱向下供水增壓(ST20/11配流量開關)