Product Code Product Description PRS-ZE1300 Constant Head Permeability Set for Ã? 80 mm cell PRS-ZE1301 Constant Head Permeability Set for Ã? 120 mm cell PRS-ZE1302 Constant Head Permeability Cell, 80 mm dia. PRS-ZE1303 Constant Head Permeability Cell, 120 mm dia. PRS-ZE1305 Wooden Stand with 3 Manometer Tubes PRS-ZE1308 Constant Level Water Tank, 7 L. PRSA-0645 Tamping Rod Ã? 8x300 mm STANDARDS : BS 1377:5 The PRS-ZE1300 and PRS-ZE1301 Constant Head Permeability Set are used to study the behaviour of soil, relatively coarse-grained soil such as sands and gravel, in its natural conditions with respect to water flow. Two models are available according to cell dimensions. The cells have an acryilic glass body with 3 pressure points at different level. PRS-ZE1305 stand is fitted with 3 glass manometer tubes each being 1000 mm long. PRS-ZE1308 Constant Level Tank 7 L, made of transparent plastic, is used to provide constant water level in the manometer tubes. Optional Equipment For De-Airing Water and Tamping Rod should be ordered separately The Constant Head Permeability Set is supplied complete with; â?¢ Ã? 80 mm or Ã? 120 mm Permeability Cell with Pressure Points at 3 different levels and 2 pcs. Wire Gauze ( fit for the prefered cell dia. ) â?¢ Wooden Stand with 3 manometer tubes â?¢ 3 m Hose Product Code Dimensions Weight (approx.) PRS-ZE1302 140x220x420 mm 3.5 kg PRS-ZE1303 180x250x640 mm 7 kg PRS-ZE1305 220x70x1700 mm 5.6 kg PRS-ZE1308 300x200x250 mm 3 kg PRSA-0645 Ã? 8x300 mm 0.5 kg