Question for Soda Siphon Owners

[TromboneAl]

Our iSi soda siphon leaks out CO2 after being pressurized. iSi sent me a new siphon tube, but it still leaks. I'm guessing that a gasket has fallen off undetected.

If you have an iSi siphon, can you tell me whether there is an o-ring, washer or gasket between this part and the top thing that screws down over it?


The parts diagram suggests no, but it is ambiguous.

Thanks!

 

[HFWR]

Has a groove around the top edge; might be an o-ring.