... compression fittings contain the Series CN Compression fittings, Series CP Compression fittings and Series CB Compression fittings, etc. ... Compression FittingsTube OD: 04, 05, 06, 08, 10, 12, 14, 16, 18, 22 ... Polylefine resin tube, Fluorocarbon resin tube, Polyurethane processed tubeSeries CP Compression Fittings: Applicable Tube: Polyrethane tube, Nylon tube, ...