Rubber stopper with hole for screw vials, butyl rubber, R-IIR, 1 piece

This is a rubber stopper with a hole that can be attached to screw cap vials or 15mL centrifuge tubes. Its unique structure with tapered top and bottom allows it to be inserted into multiple types of screw-type bottles. There are through holes for inserting syringes, luer fittings, and luer stopcocks. Material: Butyl rubber Applicable mouth inner diameter (mm): φ10, φ14.5, φ20.3 (compatible with all 3 sizes) Size: φ11 (φ10) x 5mm, φ15.5 (φ14) x 5mm, φ23 (φ20) x 5mm, Through hole: φ3.8mm