The BVS4300D is a discrete, stationary water sampler designed to handle your extreme outdoor environments. Each of your samples is placed into a separate container. The sampler is housed in a corrosion-resistant steel enclosure with a locking door and bolted-down instrument panel. The BVS4300D uses reliable, long-lasting, vacuum technology to draw water through its intake tubing. This sampling method results in faster sample draws and less disturbance of the sample contents. There is also less wear on the tubing, resulting in less frequent maintenance.  Vacuum technology benefits over peristaltic pump samplers: Accurate sample volumes Rapid transport velocities mean more-representative samples Less disturbance of sample Minimal wear on the tubing, resulting in less-frequent maintenance Reduced cross-sample contamination The BVS4300C is similar ro the BVS4300D, but it is a composite sampler that deposits its samples into a single container.