plumber's snake vs toilet jack

plumber's snake

noun
  • A long, flexible tool, often with rotating blades at its forward end, which is inserted into a plumbing pipe system and used to remove clogs or other obstructions. 

toilet jack

noun
  • Synonym of plumber's snake 

How often have the words plumber's snake and toilet jack occurred in a corpus of books? (source: Google Ngram Viewer )