High Vacuum Stopcock with Hollow Plug – Precision Glass Valve for Demanding Lab Setups

LabsGlass presents a premium range of High Vacuum Stopcocks featuring a lightweight, hollow glass plug. These stopcocks are an essential component for any laboratory working with high vacuum systems, inert gas handling, or corrosive chemical distillation.

The standout “hollow plug” design is an engineering upgrade over traditional solid plugs. By reducing the internal glass mass, the plug becomes significantly lighter, putting less mechanical stress on the connected glass joints, vacuum adapters, or flasks. This makes the stopcock easier to turn with one hand, reducing the risk of accidental breakage during critical pressure adjustments.

Each stopcock is fabricated from high-grade 3.3 borosilicate glass, offering excellent thermal shock resistance and chemical durability. The precision-ground mating surfaces between the plug and the barrel ensure an exceptional vacuum-tight seal (up to 10⁻⁶ Torr) when used with minimal high-vacuum grease. Whether you’re building a Schlenk line, a vacuum distillation bridge, or a gas manifold, these hollow plug stopcocks deliver repeatable, smooth operation and long-term reliability.