This Duotight reducer fitting is perfect for anyone setting up gas or beverage systems. Whether you're a homebrewer looking to set up a kegerator or a professional in the beverage industry, this fitting is a great choice. You can use it to connect different sized tubes in your system. It measures 6.5 mm (1/4 in.) on one end and 8 mm (5/16 in.) on the other end, and it can handle pressures up to 100 psi. Just insert the tubing, and you're good to go!