Plumber's Helper Meaning

(idiomatic) A plunger, consisting of a large suction cup attached to a stick and used to remove blockages from toilets, sinks, or drains.

Example: 2011, James Lee Burke, Sunset Limited, ISBN 9780307807458, p. 274:
  This plumber's helper was in the corner, one of these big, industrial-strength jobs for blowing out major toilet blockage.