This adapter allows you to install either the GB1 or GB2 version of our Metal Bellows on your Hasbro Proton Pack. It features a metric M8 thread on one end and a 1/4-20 thread on the other.

NEW!

Due to overwhelming demand, we now offer two versions of this product. Choose the version made in the United States for faster shipping, or our original version made in China, available around mid-September. Select based on how urgently you need the adapter.