Hey Trevor,
Sorry to hear about the carb cap sent to you! I know how frustrating that can be. Always reach out to us at help@420science.com if you think the wrong item was sent to you.
Go ahead and send us a photo of the item shipped and if you can include a picture of the banger you're using that would be helpful! I'd be happy to get you replaced.
Best,
Sarah Brown
The 420 Science Help Desk