ew1usnr
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This is an interesting item from a safety perspective. I had always taken it for granted that all scuba tank valves had burst disks, until I came across this broken-knobbed J-valve (see photo). It is marked "Made in USA" but has no manufaturers label. It has a HP port for a gauge (now occupied with a port plug) angled off to the side, but no burst disk. Perhaps this valve was intended for use with a gauge that contained its own blowout plug. Or perhaps there are blow out plugs that can be screwed into an HP port instead of into a special burst disk socket like what I am used to seeing. Dacor made a valve with an HP port, but it ALSO had a burst disk. This would prevent someone from putting a port plug where the burst disc is supposed to be.