These disposable bailers feature tapered ends and low-snag cord cleat to reduce hang-ups and snags. The angled nozzle ensures positive check-valve control. Choose from virgin polyethylene construction for strength and durability, PVC for strength and economy of polyethylene with transparent features, or FEP construction for high-purity applications. Double check-valve bailers allow you to sample from a specific depth (point-source sampling). Large opening for easy tie-off, greater water flow, and improved sink rate Individually sealed bailers are purified and rinsed with deionized water before packaging All bailers are weighted for increased sink rate.