The 17oz attachment can be used on 17 oz tapered sublimation cups and tumblers such as Single J's Pint Glasses.
See videos in the Facebook group for best practices in changing the attachment.
https://www.facebook.com/groups/SublimationBuyin/posts/3245770542317540
https://www.facebook.com/groups/SublimationBuyin/posts/3307475966146997