A hollow hex plug BSPT‑M is a precision‑engineered pipe fitting designed to seal or close the end of a female BSPT‑threaded port or fitting while allowing internal access through its hollow centre. It features male British Standard Pipe Taper (BSPT‑M) threads and a hexagonal head for easy tightening or removal with a wrench. The hollow design enables functions such as pressure testing, venting, or temporary connection of instrumentation devices without fully disassembling the system.
Hollow hex plugs are commonly used in hydraulic, pneumatic, instrumentation, and fluid systems across industries such as oil and gas, chemical processing, power generation, and manufacturing. The tapered BSPT threads provide a leak‑resistant seal when installed with proper thread sealant, ensuring reliable performance under high pressure and demanding operating conditions.

