Use to collect liquid samples from the top, bottom, or any intermediate level of storage tanks, tank cars, ponds, lagoons, and wells. A suspension cable (sold separately) may be used to lower the sampler to the desired depth. A second cable attached to the plunger assembly is pulled, allowing the reservoir chamber to fill. Releasing the cable allows the plunger to seal, holding the sample inside. Helps comply with EPA Composite Sampling Methods.