Plugs for temporary closing threaded or non-threaded holes in panels, enclosures, machinery, etc., are 

Blind stops are used to temporarily or permanently seal a hole in a panel or machine. Use the corresponding nylon locknut when the hole is not threaded. Sealing quality can be improved by means of an additional sealing washer, mounted between the gland and the panel.

Available either in Nylon or in Metal (nickel plated brass), for all types and sizes of standard gland holes.

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