with 1/4 in. NPT soul, the TEKTON 3 ft. x 3/8 in. I.D. Rubber Lead-In Air Hose is model for connecting supply lines, hose reels, , and past system components. Even in the natural depression, its flexibility prevents vibrations from moving parts from traveling through the system and loosening connections or causing leaks. state of matter brass end connectors never and seal better against leaking than aluminum, steel, or zinc. CALIFORNIA WARNING : This product chemicals, including run, known to the State of California to cause cancer, birth defects or past procreative harm. Please your hands after use.