Drip TAPE - BARB, Poly to drip

This is the transition piece from standard poly tubing to the drip tape. These are inserted 'barb' end (top of picture) into punctured poly tubing. Then a length of drip tape is slipped onto the larger end of this plastic piece (bottom of picture) which is secured by spinning the ring (middle of picture) until tightened firmly by hand. One barb is needed for each section of drip tape extending off the poly tubing. See below for project calculation hints.