Jungheinrich uses flat-face hydraulic quick-release couplers on the mast. They're designed to prevent fluid loss and dirt ingress, so they don't match standard hose fittings (https://aerocomfittings.com/categories/hose-fittings). You'll need the OEM style or an ISO flat-face equivalent in the correct size, best to check with Jungheinrich or a supplier like Stucchi or Faster for the exact match.

These are made by Junghheinrich, most hydraulic shops do not sell these or ones remotely related to these. However some shops will cut the the press fitting off with angle grinder to reuse the quick-release. Press fittting part can be replaced with generic one. However mostly are these used for reach trucks, and there the original Jungheinrnich hoses are more elastic than generic hydraulic shop ones. Also originals come off the shelf shorter so for installation you need to pulll them quite hard to install.