Adapter with O rings for the mannysub roller power head to fit all different ID speargun barrels in the market.
In the event you choose to cut the barrel down to fit the roller power head, you don’t need to re-plug your barrel, as these adapters with two O rings will seal the barrel for you.
Its highly recommend before purchasing adapters that you measure the ID (internal dimensions) of the barrel using digital vernier calipers.