Glassware stopcock with freeze extractor

A glassware stopcock comprising the combination of:

• a glass body member having an inlet and an outlet and a through passage communicating between the inlet and the outlet.
• said body member having a tapered transverse bore intersecting said passage,
• a smooth, reusable, substantially rigid polymeric, tapered stopcock plug member complimentary to and rotatably mounted in and capable of sealing engagement in said bore, and rotatable between open and closed positions of said passage,
• resilient retaining means mounted at the smaller (one) end of said plug for securing said plug in said bore,
• said plug member having a threaded stem portion extending from the larger diameter end of said tapered plug and beyond said body member, means for rotating said plug member between said open and closed positions, and
• a finger operable one piece retractor nut having a textured outer surface and mounted on said threaded stem (at the other end of said plug) and engageable with the glass body member for applying an axial force to break the sealing engagement of said plug for at least partially retracting said stem from said bore to enable the plug to be rotated between positions against said means and being smaller in length than said threaded stem portion.