Ark-Plas® Products, Inc. manufactures a complete line of Semi-Rigid Tubing for pneumatic and fluidapplications that includes Nylon 11, Polypropylene, and Polyethylene.Ark-Plas® Products, Inc. tubing is manufactured in an ISO 9001 registered facility using digital monitoringequipment to ensure our strict tolerances are maintained. Ark-Plas® Polypropylene and Polyethylene Tubing isavailable in virtually every increment from 1/16” ID to 13/16” ID. Nylon 11 Tubing is available in incrementsto 1/2”.