Repair your broken burettes
These stopcocks can be supplied with either a PTFE or glass stopcock key and have one plain side-arm and one capillary side-arm, which is drawn to a jet.

Manufactured from borosilicate glass with PTFE keys for highest resistance to chemical attack
Barrels are highly polished and the keys are self lubricating, avoiding the need for stopcock grease
Keys are fully interchangeable and supplied complete with plastic screw thread retaining device
Made to a taper of 1:10 giving a combination of performance and ease of operation