pipe coupling

13 LETTERS · STARTS WITH P

pipe coupling is a valid 13-letter word worth 21 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3I1P3E1C3O1U1P3L1I1N1G2

3 + 1 + 3 + 1 + 0 + 3 + 1 + 1 + 3 + 1 + 1 + 1 + 2 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does pipe coupling mean?