This Zinc-Plated Carbon Steel flare adapter gas fitting is economical, reusable and to mechanical pullout and can be used with copper, Zinc-Plated Carbon Steel, aluminum and welded steel hydraulic tubing that can be flared. Not recommended for polybutylene or soft plastic tubing. Commonly used for gasoline, grease, oil, water, vacuum, air lines, LP (liquefied petroleum gas) and natural gas. WARNING: This product can expose you to chemicals including chromium which are known to the State of California to cause cancer birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov - Nickel (Metallic)