Two piece construction - Nut and body. Use with copper brass aluminium or steel tubing. -65 degrees f. To +250 degrees f. Temperature range. Resists mechanical pullout. Easy to disassemble and can be re-assembled many times with no effect on the seal. No flaring tool required. Primary uses fuel equipment plumbing gases refrigeration and vacuum.Features. Dimension - 3/8 x 3/20cm .. Item weight - .8 lb.