4 Pack 3/8" (for 3/8" OD copper tube) Flare 90 Degree Brass Elbow , SAE 45° Flare Type Meets SAE J533 standard, Material: C3604 Brass Compatible with Types L & K soft (annealed) Copper Tubing Applications: pronane/LPG, natural gas, heating oil, refrigerant, non-potable water, air, oil, etc. The fitting has the Protection Cap