The aim of this work is to evaluate the quality of intact Sarapuí II clay samples taken with stationary piston tube samplers Geonor/NGI 76 mm. This sampler has a net tube length of 800 mm and an inner diameter of 76,2 mm with no inside clearance. It has a cone ended stationary piston, and pre-drilled boreholes are not required when driving the sampler. Two samples were taken from a depth l of 3.50 m to 4.30 m. One of the sampler tubes was coated on the inside with a low friction polymer in order to try to reduce the shearing stress between the sample and the sampler tube when pushing the tube during sampling, as to evaluate the influence of such reduction on the quality of the samples. The sample s quality was evaluated based on the results of incremental-loading one-dimensional consolidation tests carried out on specimens trimmed with diameters of about 50 mm and 70 mm, and a height of 20 mm. This also allowed the evaluation of the influence of the specimen s diameter on quality. All specimens were classified as excellent to very good according to Lunne et al s (1997) criterion. Moreover, no influence of the specimen diameter on the results was observed. Furthermore, the use of the polymer on the inner surface of the sampler tube seems to have had no influence on the quality of the specimens.