cientific glass honeycomb denuder (fritted disc) used in chemistry labs for gas-liquid filtration, which inspired the modern honeycomb percolator design.
Glass artist blowing a classic honeycomb percolator onto the base of a glass water pipe on a lathe, demonstrating the difficulty of building a fixed disc perc.
UNIVERSAL Water Level Guide for Honeycomb Bongs
Modular Customizable Bong