The valve is marked for the pressure but it is pretty small so I'm not convinced with the accuracy. In other words it could be 12, maybe 14 or whatever. After getting some way over carbed beers when priming I thought the spunding valve would do the trick. The build I used online included a low pressure gauge and I had one so why not? Why I saved a busted one I do not know.
They are about a $10 item and I needed about a buck to get over $40 for free shipping. I'm sure I can find something if they really don't sell one and I can get one on Amazon.
While we are in Florida I ferment warm with Kveik yeast and it stays warm until it flows through a jockey box so force carbing doesn't work well. I have also been bottling with the Flars Domino dots method in PET bottles. I forgot what a PIA bottling is but somehow recruited my wife to help.