B-Ball Sounding Plug
This B Ball Sounding Plug is made of high-quality 316L Surgical Steel. It is hollow to allow fluids to pass through the plug.
Each of the repeating 11 bulbs on the plug is 9mm in diameter, culminating in an 16 mm ball on the end which acts as a flared base to prevent over-insertion. This plug is 5" long (4.375" insertable length).