We have 305 in stock.
Metal plugs provide a tight tamper resistant test hole plug for combustion testing ports. Easy to snap in, these plugs are inexpensive and provide a more finished look than high temperature caulk.
Drill a standard 5/16" hole for the combustion test probe
After the flue pipe is sufficiently cooled, press plug into hole. DO NOT burn your fingers on a hot pipe.
The plug should snap in and provide a tight fit. It can easily be pried out with a screw driver or grasped and pulled out with side cutters.