Homebrew Diffusion Stone - 1/2" MPT Oxygen Stone - 2 Micron, Kegging Homebrew
$12.00
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316 Stainless 1/2" diameter. Stone is 1" in length. Overall length is 2.5"
It has a 2 micron stone and threads into a 1/2" MPT fitting and 1/4" diameter for O2 line.The barb is 1/4"OD.