CORRECT!!
It screws straight onto the INLET side of the pump then you screw a hose connector onto it. It sits between tank and pump to stop any cr+p getting into the pump diaphragms. It takes very little rubbish to stop the diaphragms from working.
B=GGER!! Jonrob beat me to it. and he told u to clean it out as well
yay 10 kudos points to me