This custom glass-fired air diffuser creates incredibly small bubbles, which significantly increase oxygen ratios per surface area. Micro-Pore diffusers will not break down or clog like other cheaper air stones. Simply the best air stone available on the market today! 2 Micro-pore Hogs in an "H" formation. Dimensions: 5 " x 6"

Works best with DWCLO2MIN or DWCLO2MAX