Replacement internal parts for the K24 and K29 vacuum stirrers: the PTFE joint-side components that seal against the flask neck. Select the joint size of your stirrer.
By joint size: K24 for TS24/40 necks, K29 for TS29/42
Restores the flask seal: the finned PTFE section that seats in the ground joint
Pairs with the gland seal: replace both for a full reseal
Fits with: K24 (TS24/40) and K29 (TS29/42) vacuum mixing stoppers; select your joint size.