These new G 1/4 rotary fittings are perfect to make sure you have no twists or kinks in your tubing line. In addition, if you ever need to drain you loop you know that it would be easier to unscrew a fitting with a swivel rotary then to pull the tube off a barb. Trust us this is the best fitting to change blocks or fluid on your loop. With 360 degree rotary fitting on one end you can secure the connection yet still rotate the fitting to remove any twists in your tubing loop. These are the bomb!