This Duotight Push - in Fitting Ball Lock Quick Disconnect is perfect for homebrewers who want an easy and reliable way to connect their beer and gas lines. It's great for use in home kegerators, especially in tight spaces where you want to stack as many kegs as possible. The fitting has an outer diameter of 6.35 mm and an inner diameter of 3 mm, which provides a good balance of flow resistance. Whether you're a beginner or an experienced homebrewer, this quick disconnect will make your brewing process more efficient and enjoyable.