Tube Plug (Fractional Tube)

The Tube Plug (Fractional Tube) is a vital instrumentation component designed to provide a permanent or temporary pressure-tight seal for an unused fitting port. Unlike a cap, which installs over the end of a tube, the plug is inserted directly into the body of a double-ferrule fitting and secured with the existing nut and ferrules to create a leak-proof closure. This design allows for the safe isolation of fluid or gas lines during system maintenance, pressure testing, or when future expansion points are required. Typically manufactured from 316 stainless steel to ensure maximum durability and corrosion resistance, these plugs are engineered to withstand high-pressure and vacuum conditions, making them essential for maintaining system integrity in chemical processing, power generation, and analytical laboratories.