Alembic Pot Still Lyne arm/dome seal.

[Mattmmmax]

Coming here in an over abundance of caution. I’m running the alembic pot still with copper dome on a t500 boiler. In this Unit the lyne arm screws to the dome and there is a rubber gasket between the nut and the arm that secures the two.

I notices while running the still today a extremely small amount of liquid pooling where the arm meets the dome. I know I’ve tightened this thing down as far as I can. The liquid does not smell like wash or like spirit, but more like water. Either way, I shut their whole thing down. Any thoughts here on what might be going on? Still is pretty new, only used 5 times.