The SMC KQ2VD13-37NS KQ2VD Series Inch Size One-touch Fittings Double Universal Male Elbow with Sealant is designed for versatile applications, including vacuum environments down to -100 kPa. This fitting is available in a total of 51 body models, offering flexibility for various setups. Choose between two thread material options: untreated brass or brass with electroless nickel plating for enhanced durability. The fitting accommodates a wide range of tubing outer diameters, both circular and oval, in metric and inch sizes. Compatible connection threads include Metric (M3, M5, M6), R, Rc, G, NPT, and Uni, ensuring seamless integration into your system. The seal method options include sealant/gasket seal, face seal, and gasket seal for Uni threads, providing reliable and leak-proof connections.