The 9in (228.6mm) Perforated Plate is for use with the 9in ASTM / AASHTO Constant Head Permeameter and the 9in Constant / Falling Head Permeameter. Perforated Plates placed at each end of soil permeability specimens prevent deformation and allow flow of permeants. Made of durable PVC plastic with 0.20in (5.08mm) thickness and 3/16in (4.8mm) perforations. Two Perforated Plates are included.
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