The following models are available:
HFC-O Filter housing without pressure regulator.
HFC-1 Filter housing with pressure regulator for 1 helm connection.
HFC-2 Filter housing with pressure regulator for 2 helm connection.
HFC-3 Filter housing with pressure regulator for 3 helm connection.
HFC-4 Filter housing with pressure regulator for 4 helm connection.
With a HFC Helm filter you can easily replace the filter cartridge.