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Thomson SINGLE StEP Filter Vials (patent No. 7,790,117) are designed to speed up the sample prep and analysis. The plunger filter with 0.45µM Teflon membrane nestles into the vial while simultaneously filtering and readying the sample for any Autosampler. This is a SINGLE StEP process that minimizes any loss of sample. No multiple transfers needed. Pre-slit Caps ensure a no-hassle, clean aliquot withdraw. No more breakage of expensive needles, coring problems on the HPLC or Mass Spec. Thomson Single StEP Filter Vials are compatible with most standard Autosamplers; such as Agilent and Waters. The ease of use will make the SINGLE StEP Filter Vials indispensable in all laboratories.