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During one of these run-ins a pipe plug backed out.
Hubbard claims that "at that time core holes in the engine blocks were fitted with pipe plugs.
To test the drain, fit a vertical length of pipe plus pipe stoppers and fill with water.
Some generations back my husband's family included a respected bishop of the Church of England; among his heirlooms was a pipe stopper made of semiprecious stone and shaped like a gartered female leg, as in the Folies-Bergere.