reply to TA63
That is where I found what appears to be a date. (1992)I found no other markings.I considered using the water meter, but it reads in m3, and isn't really precise enough.--The talented hawk speaks French.
Was just a thought..
reply to TA63 You could flush multiple times until you get a decent meter reading, then divide by the number of times you flushed.1 cu meter = 264 gallons