The PS taper Teflon* plug fits into a micro-finish barrel. Freezing problems are reduced and greasing is eliminated. Very fine threads on the plug and nut. Sidearm seals are heavy and strong for greater durability and easier handling.
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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.