Legend Valve 416-142 3/8" SS316 Union equipment

Industrial Stainless-Steel Union

The Legend Valve 416-142 is a 3/8 inch FNPT union made from 316 stainless steel for industrial plumbing systems. It provides a reliable connection point for pipework carrying fluids in demanding environments. The component is supplied new and carries California Proposition 65 warnings for chemicals linked to cancer and reproductive harm. Installers should verify material compatibility with the specific media and pressure class required.

Sustained Service Performance

The 316 stainless steel construction resists corrosion during continuous exposure to aggressive fluids and elevated temperatures. Threaded FNPT joints maintain seal integrity under steady pressure cycles without the relaxation common in softer alloys. The union design allows repeated disassembly for inspection or maintenance without degrading the seating surfaces. Long-term reliability depends on correct thread preparation and torque applied during each assembly.

Installation Practicalities

The union installs with standard pipe wrenches on the 3/8 inch FNPT ends, requiring no special tooling or flaring. Leaks typically arise from insufficient thread sealant, cross-threading during initial engagement, or uneven torque across the nut faces. Over-tightening can distort the seating face and create a weep path that worsens with thermal cycling. Always depressurise and drain the line before breaking the joint for service.