Use .580 Compression Elbows to make 90 degree turns with .580 od poly tubing or soaker hose. Use an elbow when you want to make a 90 degree turn. The elbow keeps your poly tubing or soaker hose from kinking and cutting off your water supply.
The Black and yellow compression fittings are unique. Besides being compression they also have male hose threads to make them very versatile.