DK Hydraulic filter leak

[Markyyg]

I just did my 50 hour service in the hydraulic filter. The yellow one inboard of the fuel tank seems to be leaking. I tightened it up as much as I can but I didn’t notice a large O-ring on the canister. Was wondering if this is normal

 

[RjCorazza]

The Kubota filters that I am familiar with all had a gasket on the filter.
I would call your dealer to confirm, but I would be very surprised if the new filter wasn't supposed to have a gasket.