Keck® like, mechanical PTFE joint (24/40) clips snap on and off with ease. Will not scratch the glass and can be used to 250°C. Can also be used for clamping stopcock plugs and barrels. For above 5 psig, it is recommended Ace-Thred™ connections over standard taper joints. Manufactured from 3M™ Dyneon™ TF1620, these clips conform with FDA 21 CFR 177.1550 and USP Class VI.