For use with copper, brass, aluminum and welded steel tubing that can be flared. Used extensively for connections of fuel, oil, air, liquid petroleum (LP), and natural gas lines. BrassCraft Flare Fittings resist mechanical pull out. Recommended for higher pressures than those covered by compression fittings. Designed to be assembled and disassembled over and over again. Reusable with long or short nuts.  Manufactured from brass rod.  Backed by BrassCraft’s 65-year history and reputation for quality and service.