Aluminium spin-on filter heads for use as a working filter or protective filter in the intake lines and return lines of hydraulic systems, to protect expensive or sensitive components such as pumps, valves or complete systems against unacceptably high levels of clogging. Suitable for operating pressure up to 14 bar and nominal flow rate up to 460 l/min. Single and double versions for line installation or tank mounting. With all common international connection types.