The Parker-Hannifin 21 Series Field Attachable Hydraulic Hose Fitting is designed to provide a secure and reliable connection for a hydraulic hose. This fitting is compatible with petroleum-based hydraulic fluids, lubricating oils, and phosphate-ester-based hydraulic fluids. It is designed to provide a cost-effective, permanent, crimp-style connection. This fitting is easy to install and provides a secure and reliable connection for your hydraulic hose. FleetPride is your First Click in Heavy Duty®.