˙Made of white rubber
˙After the bottom end is plugged into the test tube, the upper edge can be turned outward to cover the test tube opening to increase sealing
D33G-19006 OD6mm
D33G-19011 OD11mm
D33G-19013 OD13mm
D33G-19014 OD14mm
D33G-19016 OD16mm
D33G-19018 OD18mm
D33G-19024 OD24mm