This 1/2" barb elbow X 1/2" MPT is used to connect to any FPT fitting. Most common use is to come off a PVC Tee with a 1/2" FPT opening. Works with any poly tube with an ID of .550 to .600 (17 mm). Works with all our .700 OD and 17mm tubing.
By using a double barb, the tubing is pushed over the barb for a very tight fit.