Caplugs 1/4" (0.25 inch) Flush Mount Black Plastic Body and Sheet Metal Hole Plug - Qty 25

For HVAC testing.Use 1/4" for temperature rise/drop and 3/8" for static pressure readings.With correct hole dia, easy to apply and remove.With 25/50 pc packs, you'll always have a spare.

I use these to plug the unused jacks on my guitar amps. Fits perfect, shipping was quick 👍

Ok Quality + Plug ends have a bulge which helps to keep them in place once the plug is pushed in. Obviously, the hole must be 1/4" for this to work on typical sheet metal.

Just run of the mill cheap plugs. Most use cases you’re better off with a rubber plug.

excellent part