Thanks. I'll have to play around with my spunding valve to dial it in (from MoreBeer, no calibration marks, but I gather the only thing that matters is the gauge.) I got it for this purpose; as it only goes to 15 psig, it won't do for carbonating at fermentation temperature. But 5ish sounds perfect as it will not significantly carbonate, but solves my other problem of getting a CO2 supply to the ferm chamber to draw samples. This weekend I expect to brew, and I'll try a ~5 psig fermentation. I'll report in a separate thread.
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