With threaded closure fit. Economical and versatile, these funnels are constructed to provide a precise fit with an all-PTFE stopcock assembly and plastic stopper. Stopcock is secured to the body with a positive threaded closure to provide a tight, leakproof fit and eliminate accidental dislodging during use.
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Colonial Scientific has teamed up with the industry leaders, Fisher Scientific and VWR, and now offers their entire product line. Colonial Scientific provides any part from the Fisher Scientific site with a part number.