Can this attach to the 330LK string weed eater?

It will not work with the 330LK. For some reason Husqvarna flipped how the attachments attach. The male part of the attachment is now on the motor end and the female side is on the attachment.

Hello Hector. The AH721 Hedge Trimmer Attachment can easily convert your Craftsman, Troy-Bilt, Remington, and other attachment capable trimmers into a hedge trimmer. It's unknown if it will specifically fit a 330LK model string weed eater. Thank you.