Pyrex^® PTFE key-hole stopper, color-coded

Pyrex^® PTFE key-hole stopper, color-coded, orange, stopper size 13

Pyrex^® PTFE key-hole stopper, color-coded, yellow, stopper size 22

Pyrex^® PTFE key-hole stopper, color-coded, blue, stopper size 16

Pyrex^® PTFE key-hole stopper, color-coded, black, stopper size 9

Pyrex^® PTFE key-hole stopper, color-coded, green, stopper size 19