disposable polyethylene bailers are made with the highest regard to quality in the marketplace. When you use one of our bailers, you will see the result of a rigorous quality control program and the dedication of a quality-driven staff. Our strict part requirements have virtually eliminated leaking. We pay extra to save you valuable time and effort in the field. The large open-top design allows nearly an inch of open space for easy tie-on. The thick, rigid construction with 100% pure virgin polyethylene guarantees a sturdy bailer with no warping or collapsing. A Double-Check Valve Bailer (also known as a point-source sampler) allows sampling of a specific depth by utilizing a check valve at both the top and bottom of the bailer.