These stopcocks are vacuum-tight, yet cannot stick and will not freeze.
- Polypropylene with low-friction, Teflon™ TFE plug
- Stopcocks are vacuum tight
- Will not stick or freeze
- Plug bore 2mm & 4mm
- No lubricant needed, so no lubricant contamination
- Serrated tubulation for 1/4" to 5/16" tubing
- Autoclavable