stopcocks for burettes
- Burette stopcocks, straight, AR glass, with glass plug
- Burette stopcocks, straight, DURAN, with glass plug
- Burette stopcocks, lateral, AR glass, with glass plug
- Burette stopcocks, lateral, DURAN, with glass plug
- Burette stopcocks, Safety needle-valve stopcock with spindle of PTFE, AR glass
- Burette stopcocks, Safety needle-valve stopcock with spindle of PTFE, DURAN
- Burette stopcocks, straight, AR glass,with plug of PTFE
- Burette stopcocks, straight, DURAN, with plug of PTFE
