Kevin T of NB Tranquility got it. It is the breather for the ground paddles on a lock on the Huddersfield Narrow Canal. The pepperpot-shaped device seems to serve as a bollard or strapping post too.
This is at Lock 12W.
Chillin' and a chilled cat - After a heavy night Del got woken up by a boat going by at 6.45am. As he was up he decided that it might be a good chance to just get out of Crick and moo...
2 hours ago