'Pipes' in the Bible

And said unto me, What seest thou? And I said, I have looked, and behold a candlestick all of gold, with a bowl upon the top of it, and his seven lamps thereon, and seven pipes to the seven lamps, which are upon the top thereof:

And I answered again, and said unto him, What be these two olive branches which through the two golden pipes empty the golden oil out of themselves?