PYREX®, borosilicate glass with PTFE needle valve.

• Lubricant is not required (no seizure, no contamination with grease)
• Interchangeable elements
• Precise flow control

These chemically inert stopcocks can be used at temperatures up to +200 °C. Two different models are available: general purpose (vacuum rating up to 10^-4 mm Hg) and high performance (vacuum rating up to 10^-9 mm Hg).