Like all fittings, to prevent frost damage the brass hose fittings should be drained down with any valve left on the open position.Industrial air and non-potable water service (2 except 126 series not recommended for water due to fiber gasket - for air service only.Compressor lines, pneumatic tools, low pressure spray.Construction air and water transfer.Lead free option for potable water service.Crush-resistant and corrosion-resistant brass connections