No - I wasn't aware there were seals there - I just bolted it onto the Chineseum intercooler...
But it hasn't been recharged, last time I checked at my prefered garage, I was expecting to pay a fixed £60 charge for AC service - I hope the guy was confused - after explaining it was fully depleted, he quoted me over a ton for full refill with the fixed price service on top - so may need to wait for a month with better cashflow.
Not wishing to encourage "while you are in there" syndrome, but my rad wasn't in the best condition.