By matching the notches I assume you mean?
Am pretty bad at such things but will try.
Thanks.
Probably been mentioned upthread, but the canal and river trust shows showers on its canal maps.
https://canalrivertrust.org.uk/enjoy-th ... er-network
but from a bit of time peering over I only managed to find one - at Greenberfield near Barnoldswick - funny, I have never noticed them when there - and even some places, major canal centres, where you would expect to find them don't seem to have them.
Part of the general poshing up of many pursuits I suppose - many boaters doubtless have their own very nice onboard facilities.
Still - useful for water taps in locked cabinets - more common - saw one at Salterforth just up the Leeds and Liverpool - if freecamping could be very useful for filling a water bladder of an evening.