Guangxing Drive-Point Piezometers are excellent permanent or temporary wells used to monitor shallow groundwater, soil, and gas up to 25 feet below surface. These well points are ideal for initial site investigations and for long- or short-term applications. Specification::: These wellpoint dewatering filter system incorporate a self Jetting head with a non-return rubber ball valve, a stainless steel slotted filter screen, a G.I. inner drain pipe and a top coupling which threads to standard 1 ½"" (40 mm) riser pipe. The serations on the jet head render penetration, even through hard grounds easily. Specially designed slots of stainless steel screen, allows maximum water flow with minimum pressure drop and prevents passage of even fine material. Advantage ::: The wire stainless steel screen eliminates clogging due to corrosion or deterioration due to chemical action. It has a reverse self cleaning design to void choking. If you looking for it ,Please feel free to contact with me without any hesitation , Range: This kind well screen for water well drilling, geotechnical drilling, environmental drilling, mineral exploration drilling, geothermal drilling, construction drilling, water utility and gas utility leak detection work along with a wide range of other diverse applications. "