Cold_Steel

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Shut Off Check/Ball Valve | MoreBeer

This is the part that I should attach to my O2 tank for a Diffusion Stone.

humann_brewing

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That is a check valve to be able to stop the flow of O2, you need one of these:

Oxygen Regulator - Dual Gauge | MoreBeer

I got one off eBay for a lot cheaper, I would check there, for example:

HUDSON OXYGEN THERAPY REGULATOR NO 2100 - eBay (item 360187887484 end time Sep-16-09 08:22:45 PDT)

That way you can get a DO meter or know how much you are putting in.

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On tap: Batch 1 Flanders Red, experimental sour 1.072 > 1.000, #70 Simple, gone complex pale 1.063 4/5/13, #71 French IPA, American IPA with spanish cedar and fermented with 3711 1.059>1.008
Fermenting: #72 Flower power saison 1.053>1.004 with lavender and jasmine
Aging: #67 Bareleywine 1.116 11/07/2012, Flanders 2 batches 1.056 and 1.060 12/12/11 and 3/26/12, Smoked Porter 1.063 10/11, pepper RIS 1.088 7/11, Kriek, 1.052 12/11, RYE IPA sour experiment 8/12, Berliner Weisse 1.030 9/20/12

BrewBeemer

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As long as you only keep it on the low pressure secondary side after the regulator and between your stone it will be no problem. You will shut off the primary side valve at the bottle before the regulator when your done adding oxygen to your wort in the fermentor? It's not good to leave the regulaltor handle screwed down on the diaphragm while in storage, this a strange practice while your Co2 regulators are set full time. I'm going by good welding practice on this one as safety with the bottles valve also shut plus preventing your bottle or tank from becoming empty weeks later if the regulator leaks or keeps creeping up in pressure way above your set secondary pressure.

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Cold_Steel

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Would this one work too?
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