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syringe-operated filters with glass fiber prefilter. It' s white , for the housing and membrane, it' s welded together. Compared with the common syringe filter, it has better flow rate and better filtration efficiency. The classic range is available in all of the major membranes including Nylon, PTFE, PVDF, and PES, which are supplied in 13mm, 25mm, 30mm formats in polypropylene housings.