The machine is used to determine the permeability coefficient of the soil, The whole system is compact. Reasonable design, Convenient to disassemble and assemble, equable stress (use the hand wheel to do the rotary extrusion in the center) , good leak-proofness. Under 200kpa pressure there is non-leakage, all accessories made of high quality cuprum except frame, Attractive looks is durable. There are two Position-limit flight of steps on the protective ring, during the process of pack stop-hydrosphere, not only assure the sample will not hang, but also protect cutting ring and control the deformation degree of rubber ring.