Coliwasa Tubes
![Coliwasa Tubes](https://krackeler.com/tt/lg/graphics/0006/jpg/76100-combined.jpg)
The two-part borosilicate glass tube has a ball in the lower end which acts as a check valve to prevent sample loss during transfer. Both parts are prescored, allowing the unit to be easily snapped apart for safe disposal. Each part comes wrapped in corrugated paper.