By adding a 1/2" EZ Seal Weld-Less Bulkhead to the nut on the lid, you can create many different combinations. This makes filling from the top much easier.
In the images below, you can see the different attachments you can add to the EZ Seals. Attachments are sold separately. Included is the 1/2" EZ Seal Weld-Less Bulkhead already in position in the nut of the Lid.
The new 4" Fermenter Lid screws onto the top of the tank. The lid seals against a silicon red o-ring and the threads at the top of the tank. The silicone ring, as shown, is sold separately.