The Kabis. Model 2 discrete-level sampler is constructed from stainless steel and will fit into a 4" well. Prior to lowering, the top of the sampler is unscrewed and a three clean, 40ml vial are screwed on the sampling cap. The cap is resecured to the sampler and the sampler is lowered to the desired depth for sampling. The design of the sampler does not allow liquid to enter the vial until the sampler reaches the appropriate depth and held in place. After approx. 8 minutes, the vials are filled and the sampler is retrieved. The vials are unscrewed and secured with screw caps.