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All answers having "___ pipe" as clue:

3 Character Answers:

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PVC



4 Character Answers:

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DOWN

DUCT

FLUE

REED

TUBE



5 Character Answers:

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BRIAR

BRIER

ORGAN

PEACE

SEWER



6 Character Answers:

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ORGANS



7 Character Answers:

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AIRDUCT

CONDUIT

CORNCOB