Recommended for high-temperature, medium-pressure hydraulic oil line applications such as engine compartments, foundries, etc. Recommended Couplings: PCK Couplings (-4 to -16), Global Braid Couplings -GB (-4, 10 and -16), MegaCrimp® Couplings (-4 to -20), GlobalSpiral™ Plus Couplings (-24 and -32).