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These PYREX replacement Kuderna-Danish flasks have s a 24/40 outer Standard Taper upper joint and 19/22 inner Standard Taper lower joint.

Cat. No. 2158-250FO includes a pair of stainless steel springs.
Cat. No. 2158-500FO includes a pair of stainless steel springs and two sizes of Keck clamps.
Cat. No. 2158-1LFO includes a pair of stainless steel springs.

Capacity

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Product Number	Product Name	Qty./Pk	Qty./Cs	Brand	Price	Unit Size
2158-250FO	PYREX® 250 mL Kuderna-Danish Replacement Flask with Hooks	1 / Pk	4 / Cs	PYREX®	$493.07	per case
2158-500FO	PYREX® 500 mL Kuderna-Danish Replacement Flask with Hooks	4 / Pk	4 / Cs	PYREX®	$501.19	per case