Rubber Stopper, #4

Similar to CG-3026 and CG-3027 except with two holes. These stoppers are suitable for practically all general laboratory uses. Composition ensures resiliency and pliability over a long period and withstands laboratory conditions without hardening. The dimensions are in accordance with specifications established by the N.B.S. and are low in free sulfur (1/2%). 

Autoclavable at 250°F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application.