1/4” Barbed Connectors or Micro Connectors, Barbed Fittings: Drip irrigation barbed micro connectors are used to make connections between 1/4” drip irrigation micro tubing or to connect 1/4″ drip irrigation micro tubing and 1/4″ soaker hose irrigation dripline to 1/2″ or 3/4″ drip irrigation poly tubing.