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From memory, both my bayonet seals were just plain black (neoprene?) rings.
It might be that if your bayonet won't stay locked in place then the plastic retaining catch (on the RHS of it) might not be engaging properly?(see schematic diagram in my original post)
If this were the case then the pressure build up in the cooling system would more than likely start pushing the bayonet off causing a leak.
Just a thought but worth double checking?
many thanks to spirochete to this excellent post. I now have glorious heat in my car. top man***********
Currently in fizzybum65's garage:
renault laguna mk1