Tube Plug (Metric Tube)

The Tube Plug (Metric Tube) is a specialized instrumentation component designed to provide a secure, pressure-tight seal for an unused metric fitting port. Unlike a tube cap, which is used to terminate a length of tubing, the plug is inserted directly into the body of a double-ferrule fitting and tightened using the fitting’s existing nut and ferrules. This creates a leak-proof, metal-to-metal seal capable of withstanding high-pressure, vacuum, and high-vibration conditions. Typically forged from 316 stainless steel for superior corrosion resistance, tube plugs are indispensable for isolating specific sections of a fluid system during maintenance, pressure testing, or for sealing off ports reserved for future system expansion in industrial and analytical applications.