Stuffing box. A recess to receive the packing around piston rods, plungers and valve stems.

Submerged pump. A pump which works under water.

Stub-End.

Strainer.

Sucking wind.” A leakage of air into the suction part of a pump.

Supplemental piston. The piston which operates the main valve in the steam pump.

Swing check valve. One which swings upon a pivot or hinge in opening and closing.