Parker CPI / A-LOK Instrumentation Tube Fittings are designed as leak-free connections for process, power and instrumentation applications. These single and two ferrule fittings are manufactured to the highest quality standards and are available in a broad range of sizes, materials and configurations. The Parker CPI / A-LOK tube fitting has been specifically designed for use on instrumentation, process and control systems, analyzers and environmental equipment employed in chemical, petroleum, power generating and pulp and paper plants. CPI / A-LOK fittings have also been used extensively in other applications and industries wherever high reliability and quality are required.