Enclosures for electronic components sometimes have more holes than are actually ultimately needed. In order to provide reliable explosion protection, it is vital that these unused holes are properly sealed. R. STAHL's stopping plugs are perfect for the job. They are available for Ex e and Ex d enclosures, with metric or NPT threads in a variety of thread sizes (M16-M100 and 3/8-4" NPT), and in plastic, nickel-plated brass or stainless steel. With such a wide variety to choose from, we have the right stopping plug for any application.Stopping plugs for sealing unused holes in enclosures (Ex e, Ex d)Threads: M16-M100 (metric) and 3/8-4" (NPT)..