Index: leahi_dialin/fp/modules/permeate_tank.py
===================================================================
diff -u -r20c821bd230fc7689a0275a2918981669ff5cc19 -rf03c9a32180573f2430105ad69eb91d9f597a96b
--- leahi_dialin/fp/modules/permeate_tank.py	(.../permeate_tank.py)	(revision 20c821bd230fc7689a0275a2918981669ff5cc19)
+++ leahi_dialin/fp/modules/permeate_tank.py	(.../permeate_tank.py)	(revision f03c9a32180573f2430105ad69eb91d9f597a96b)
@@ -20,8 +20,9 @@
 from leahi_dialin.common.constants import NO_RESET
 from leahi_dialin.common.msg_defs import MsgIds, MsgFieldPositions
 from leahi_dialin.common.override_templates import cmd_generic_broadcast_interval_override
-from leahi_dialin.protocols.CAN import DenaliChannels
-from leahi_dialin.utils.base import AbstractSubSystem, publish
+from leahi_dialin.protocols.CAN import DenaliCanMessenger, DenaliChannels
+from leahi_dialin.utils.abstract_classes import AbstractSubSystem
+from leahi_dialin.utils.base import publish
 
 
 class FPPermeateTank(AbstractSubSystem):
@@ -31,7 +32,7 @@
     Filtration Purification (FP) Dialin API sub-class for permeate tank related commands.
     """
 
-    def __init__(self, can_interface, logger: Logger):
+    def __init__(self, can_interface: DenaliCanMessenger, logger: Logger):
         """
         @param can_interface: Leahi Can Messenger object
         """