Anvil has released two Oxygenation Kits (one with regulator and one without) that provide the optimal setup for oxygenating wort. The heavy duty tube with integral barb is an extra-long 24" that can reach the bottom of fermenters.

The 10 micron stainless diffusion stone is a perfect size for oxygenation, yet pourous enough to let sanitizer pass for easy sanitization.