316 Stainless Steel Construction Torque-Free, Leak-Proof Seal Double Ferrule No Special Tooling Required Ideal for Instrumentation Application / Not Sanitary Grade DuvaSanitary.com Compression Fittings may be sourced from surplus MTRs may be available upon request The Compression X Male NPT 90° 316SS Elbow connects square-cut tubing to Female Pipe Thread. Compression connection is made by inserting the tube into the fitting and tightening the nut.