CPI™ /A-LOK® Tube Fittings

The Parker CPI™/A-LOK® tube fitting has been specifically designed for use on instrumentation, process and control systems, analysers 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.

Parker CPI™ and A-LOK® tube fittings are industry-leading solutions designed to deliver reliable, leak-free connections in critical fluid and gas handling systems. With a reputation for quality and precision, these fittings are engineered for ease of installation, superior performance, and long-term durability. CPI (Single Ferrule) and A-LOK (Double Ferrule) design ensures a strong mechanical grip and gas-tight seal, making them the preferred choice across industries such as oil & gas, chemical processing, power generation, and instrumentation.

  • Design: CPI (Single Ferrule) and A-LOK (Double Ferrule).
  • Material Options: Available in stainless steel, brass, and other alloys for broad application compatibility.
  • Tube Sizes: Offered in metric and fractional sizes ranging from 1/16″ to 2″ (2 mm to 50 mm).
  • Pressure Ratings: High-pressure capability, typically up to 6,000 psi (depending on size and material).
  • Temperature Range: Wide operating range, suitable from cryogenic to elevated temperatures (up to ~650°C with proper material selection).
  • Standards Compliance: Meets or exceeds industry standards such as ASTM, ASME, and SAE requirements.
  • Applications: Ideal for instrumentation, process, and hydraulic systems where safety, reliability, and performance are critical.