Techline 17mm fittings are a line of connectors to help you connect drip tubing to PVC and other drip lines. They are compatible with any 1/2" drip tubing. Netafim fittings are "barb" fittings, which once installed in your tubing, won't ever come back out. These fittings are economical and made especially for Netafim tubing.
This fitting is similar to tee fittings, but only go in one direction. These are best used for turning corners around buildings or pavement.