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Freeze dry flasks with Snap-On rubber caps. Caps have either 1/2-in or 3/4-in PTFE adapter tubes either plain or with stopcock. Compatible with all major brands of freeze dryers and manifolds. Borosilicate glass flasks with uniform wall weight for good temperature transfer. Wide mouth provides ease in getting product in and out of the flask. Black rubber cap matches OD and ID on flasks. Cap comes with either a straight PTFE tube or a with a PTFE valve. Caps fit standard lyophilize manifolds. Complete; flask, cap and pTFE adapter.