It has a sticker which reads...Helium leak tested, 3X10 to-9atm.cm 3/Sec. I must admit I do not know much about this item. The center block has a number 195400 on it. The black knobs read...Parker Vacuseal 4.316. The 2 thicker arms extending read...P-316, HCN, 75. The thinner arm has no marking.
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