This paper presents the results of experimental and analytical investigations on the behavior of GFRP pipes used in the water supply pipeline systems. The pipes consist of two filament wound outer GFRP tubes and polymer mortar between the tubes. Parallel plate loading tests were conducted and the test results were compared with predicted results. The load-deflection prediction was conducted by the FE analysis and the conventional strength of materials approach. It was shown that the results obtained by the experiment and analysis were agreed well.