The BVS4300C is a composite, stationary water sampler designed to handle your extreme outdoor environments. All of your samples are deposited into a single container. The sampler is housed in a corrosion-resistant steel enclosure with a locking door and bolted-down instrument panel. The BVS4300C 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 BVS4300D is similar to the BVS4300C, but it is a discrete sampler that deposits its samples into multiple containers.