Sold as each. Yellow brass. Can be assembled and re- assembled, resists mechanical pull out. Compatible with copper, brass aluminum and steel hydraulic tubing. Used on low, medium and high pressure lines. -65 to +250 Deg. F. 5/8" Flare x 1/2" Flare. Manufacturer"s number: ABUS4-108. Country of origin: United States. Distributed by Anderson Copper & Brass.