The Wheaton 4-foot 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 upto 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. This Coliwasa comes with a 48in long cleaning brush. Samplers are chemically-resistant. 760mL Capacity. 4 ft. Length. 3.5 I.D. x 4.12cm O.D.. Clear. Polyvinyl Chloride. 48in Length Brush. Wheaton #: 885250.