The Grab Sampler® III is for use in sampling hazardous and corrosive materials including wastewater, is constructed of chemicaly resistant stainless steel and polypropylene, has a wide mouth that accepts light sludges and slurries, and features a modular design with 6' add-on sections up to 24' in length. This unit works on the same principle as the Grab Sampler II. The Grab Sampler III fits wide-mouth bottles with a 70-400 screw thread finish. A displacement plunger allows the collection of samples in a 1000mL bottle with approximately 1" of head space between the sample and the underside of the bottle closure. The Grab Sampler III includes a safety-coated 1000mL bottle and a green urea cap with a PTFE® liner. An extension kit (Cat.No. 12-990471, sold separately) includes a 6' stainless steel extension shaft, coupling and connecting cable. To use it, you pull a cable that lifts a spring-loaded plunger, allowing liquid to enter through four 5/8" x 1-1/2" slots.