The Duotight Push - in Fitting Ball Lock Quick Disconnect (QD) Gas In - 6.35 mm is a must - have for homebrewers. Whether you're brewing in a small apartment or a dedicated homebrew space, this product shines. It's designed to work with EVABarrier 6.35 OD Tubing, making it suitable for mobile draft setups or keeping your kegerator tidy. The 6.35 mm OD with a 3 mm ID offers adequate flow resistance with just 3.2 ft of length. It's made for homebrewers who want a reliable, easy - to - clean, and space - saving solution for their gas connections. So, if you're tired of dealing with old - fashioned and hard - to - clean ball lock disconnects, this is the product for you.