Paragon Peep Plug with Hole

PL4 Peephole Plug, tapers from 1 5/8" to 3/4", with 1/8" (3.17 mm) thermocouple hole. Conveniently monitor a pyrometer without having to drill a hole in the kiln for the thermocouple. Before ordering, measure the diameter of your thermocouple.

Paragon part number PL4