The ball in the lower end of the two-part borosilicate glass Coliwasa tube acts as a check valve to prevent sample loss during transfer. Ideal for liquid sampling of drums and tanks. Borosilicate glass is highly chemical resistant. Pre-scored glass coliwasa tubes are designed for single use and are fully disposable. Sampler O.D. x Length: 2.2 x 106.7cm. Tapered bottom with 1.3cm (1/2-Inch) diameter opening.
Wheaton Coliwasa tube samplers feature a PTFE seal which allows sampling to within 1/2-inch of the drum or tank's bottom. The positive seal allows transfer of sample to bottle without any loss. Up to 200mL sample sizes can be drawn. Glass Coliwasa tube samplers are available in disposable, pre-scored models as well as borosilicate glass models which are un-scored and designed for repeated use after cleaning. Sampler O.D. x Length: 2.2 x 106.7cm. Tapered bottom with 1.3cm (1/2-Inch) diameter opening.
The Wheaton® reusable clear PVC Coliwasa sampling tube is designed for safe and simple sampling of drums and tanks. Uniquely designed top spin bar and bottom valve plate mechanism provides a positive seal for sample retention along with greater control for releasing the sample. Modular design also adds flexibility by enabling the connection of several sections to form a longer sampling unit up to 20 ft. (610cm). To use the Coliwasa, simply turn the bar on the top of the handle, insert slowly into the drum to collect liquid in the column, pull the top handle to seat the bottom valve plate and spin the top handle closed, trapping the liquid in the sampler.
Wheaton PVC Coliwasa samplers are chemically-resistant and furnished complete with a matching length cleaning brush. Available in both 4- and 6-foot lengths. Sampler extensions and connectors as well as replacement shafts are sold separately.