Corrugated steel pipe products can tend to the requirements of our customers with the greatest versatility and flexibility in their projects. In addition, CSP products provide the highest service life, strength and hydraulic properties. Research has shown that corrugated steel tube and pipes generally provides outstanding soil side durability, and with proper coating and invert paving can virtually attain any required service life. Maintenance cost can be effectively controlled through modern structural and durability design criteria. The behavior of both soil side and the effluent side of the pipe have been rigorously studied.