The Poly-Flo Natural 66-P is a flexible polyethylene thermoplastic tubing used in aircraft instrument and pneumatic systems. It is manufactured from high molecular weight polyethylene, which provides improved strength and resistance to environmental stress cracking compared to standard polyethylene tubing.

The 66-P (3/8") size is commonly used for pitot-static, vacuum, and low-pressure pneumatic lines in general aviation aircraft. It is designed for use with Nylo-Seal or compatible compression fittings, ensuring secure and leak-resistant installation in instrument systems.

This tubing is supplied by the foot and is cut-to-length for installation during maintenance or aircraft assembly.

Key features include:

POLYFLO part number: 66-P (Natural)
Tube size: 3/8 inch OD
Material: high molecular weight polyethylene (thermoplastic)
Designed for low-pressure pneumatic and instrument systems
Good resistance to environmental stress cracking
Flexible and lightweight aircraft tubing
Compatible with Nylo-Seal style fittings
Supplied per foot (cut-to-length)
Common use in pitot-static and instrument air lines
Natural translucent color
Suitable for general aviation maintenance applications