The 1/8" barbed connector is used to connect two ends of 1/8" micro tubing with .115 ID to .120 OD to connect or to extend 1/8" micro tubing from the drip tubing. By using a barb, the micro tubing is pushed over the barb for a very tight fit. Use for continuing lengths of micro tubing or to extend a micro tubing from the poly tubing. Use the A040 hole-punch to make the correct size hole.