Donaldson Head Assemblies

A head assembly is the mounting section a filter attaches to, carrying the inlet and outlet ports, the sealing face and, in most cases, the bypass valve. It is the part that stays with the machine while filters are changed against it, so a damaged sealing face or a failed bypass shows up as leaks or as filtration that has quietly stopped happening.

Heads are matched to a filter family, a port size and a thread. Search by Donaldson part number, or send us the number from the existing head.