This is what I use. Light weight. flexible and tough. Way better than rubber hose.
http://www.automationdirect.com
NITRA™ Flexible Pneumatic Straight Bonded Polyurethane (PUR) Tubing
New! ... Bonded Straight Polyurethane (PUR) Tubing/ Pneumatic Hose
NITRA™ Bonded Polyurethane (PUR) Tubing is made by continuously bonding standard NITRA polyurethane tubing. The result is a strong, organized, color-coded package that makes installation neater and easier. This air tubing is also referred to as poly tubing.
NITRA polyurethane air tubing is ether-based to provide excellent hydrolysis, oil and cold resistance.
NITRA polyurethane pneumatic tubing is strong, flexible, and offers superior kink resistance compared to other pneumac air tubing. Poly tubing can be used in applications requiring a high pressure air tubing.
With its extremely tight outside diameter tolerance, NITRA polyurethane pneumatic tubing is ideal for use with NITRA push-to-connect fittings.
NITRA Bonded straight polyurethane tubing starts at: $13.00 (50 ft. package)
Features:
Inch and metric air tubing sizes available
Contrasting colors – black, clear blue, blue
Secondary bonding process maintains pneumatic tubing geometry
50 foot package size
Shore A 98 hardness
Strong, flexible and kink resistant
Made in USA
Complete NITRA Bonded Polyurethane Air Tubing Overview