The 1/2” barb Y X 3/4" MPT is used for the connection of two lines of drip lateral to a PVC pipe using a PVC tee with 3/4” FPT. Works with any of our 17mm dripperline or .700 OD poly tubing. By using a double barb, the tubing is pushed over the barb for a very tight fit. Use for a layout of drip tubing or drip line.