Designed for process & Instrumentation Tubing's. Instrumentation Tube Fittings provide a zero leak proof seal which is withstands high pressure, vacuum, temperature 8L vibration. Tee, Elbow 8L Cross Fittings are manufactured from stainless Steel SS. 316, 4‘ SS. 304, Carbon Steel and Brass. Compression Nut threads are silver plated to extend the life of product.