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This shoulderless vial features a full width opening of 23 mm for ease of access, a high degree of resistance to organic solvents, and sufficient translucence so that reagent levels or the presence of filter paper can e easily detected. The unique thread design of the closure allows the vial to be sealed, and opened with an easy 1/4 turn. The quality of the sealing system is such that it is not necessary to tighten the closure with lot of pressure to achieve a leakproof seal. Polyethylene closure may not be autoclaved.