[Wikipedia excerpt: [ …..’Quickfit is a brand of laboratory glassware, produced under the Pyrex trademark and distributed through various fronts in differing countries; e.g. Corning in North America. The glassware is well known worldwide for its build quality and it appears in numerous laboratories. A large percentage of the glassware makes use of ground glass joints….The QuickFit brand is blown in Stone, Staffordshire, in the United Kingdom and marketed through the Scilabware front in the United Kingdom. ‘Quickfit’ has become a genericized trademark for all ground glass. Whilst the ownership and name of QuickFit has changed numerous times, all genuine QuickFit glass is stamped with a Q, displaying the brand name, the word Pyrex and the part code….’].