Using a pre-filled cup on the plunger helps it to generate additional pressure against the clog. If the cup only has air in it, trying to push air through the water in the toilet bowl to reach the ...

Suppose thi pumps are worked twenty-strokes in a minute we have removed 314,285 2-7 cubic fee' of air. Suppose the plunger was let in at New York at the commencement of operating th pumps ...