Swivel Nut Valve Connector - 45° Flare 5/8"Sold in sets of 5 Swivel fittings are rotating adapters and connectors that allow the coupling and hose connection to rotate, preventing twisting, kinking and excessive bending to reduce mechanical stress on hoses that can lead to premature hose failure. Brass swivel fittings are used in pneumatic and liquid flow control systems to increase maneuverability.