PYREX® Stopcock, straight bore, plain arms, PTFE key, 4.0mm bore

Manufactured from 3.3 expansion borosilicate glass complying with ISO 3585 (ASTM E-438 Type 1 Class A), PTFE stopcock key with silicone 'O' ring and PP retaining device, The barrels are highly polished and the keys are self-lubricating avoiding the need for stopcock grease, PTFE keys are fully interchangeable, Stopcock barrels are accurately manufactured with a 1:10 taper