These simple inexpensive packers inflate with a hand pump and are available in 1.8" and 3.7" (46 mm and 94 mm) diameters. Primarily for use in 2" and 4" (50 mm and 100 mm) monitoring wells, they can also be used in smooth boreholes and wells with 1.9 - 5" (48 - 127 mm) internal diameters. Typical inflation pressures for the 1.8" (46 mm) packers are from 20 - 40 psi (140 - 345 kPa) above hydrostatic pressure, and from 20 - 30 psi (140 - 205 kPa) for the 3.7" (94 mm) packers. The Packers utilize a gland of black carbon reinforced rubber (BCR) on a Sch 80 PVC body. They are lowered on flexible low density polyethylene (LDPE) tubing or a rigid PVC drop pipe. If a rigid drop tube is not required for your application, it is recommended to attach a safety line to the eyebolt provided, such as the Solinst Model 103 Tag Line. The inflation line of 1/8" (3 mm) low density polyethylene (LDPE) is easily attached using the nylon compression fittings on each packer.