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Glas-Col's glass and PTFE stirring assemblies are designed for overhead agitation in air-tight systems with single- or multiple-neck flasks. They also reduce the possibility of sample contamination and are well suited for agitating corrosive and caustic samples. Each PTFE bearing consists of a threaded borosilicate glass adapter with an inner standard taper joint of the indicated size, a saddle O-ring, a body bushing with a compression and locking nut, and a precision PTFE inner gearing.