LDR 508 56-6 Flare Cap, 3/8-Inch, Brass. Used on flexible copper tubing. Can be assembled and disassembled without damaging fitting joint. Used for gasoline, grease, oil, natural gas, refrigeration, air conditioning and compressed air lines. LDR is the leader in high quality kitchen, bath and plumbing products for home improvement. Look for more high quality LDR plumbing fixtures, rough plumbing and decor options.