These high quality compression fittings from XSPC can be easily installed by putting a coin in their notch to screw them in. This compression fitting is made to be used with 1/2" ID x 3/4" OD tubing only. In contrast to barb fittings, compression fittings come with the redundancy of having a clamp. This creates a more secure connection without an addition component. Comes with a single fitting. Comes in an attractive black chrome color to match the rest of your case and water loop no matter what color the rest of your components are.