K-23 - 3 Inch Insulating Firebrick

Available from Seattle Pottery Supply when we last checked. Sold from the shop’s own store; the price there is the one that counts.

Measure 9 in x 4-1/2 in x 3 in, Rated 2300 Degrees F https://www.morganthermalceramics.com/media/0wobjak3/k-ifb-series_eng.pdf