Jacques, I took one of mine apart and there was a white fiber gasket in between. When I re-assembled it I made one large oring out of two smaller ones by cutting and super-gluing the ends together. I didn't think the oring would seal against the threads,so I used a wee bit of silicone gasket maker where the oring sits and screwed the reservoir down onto the ring.I will find out tomorrow if it is holding or not.It seemed to fit real nice and I got good compression on the oring.
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