This is NOT the two piece kit, it is the adapter only. Fur-Eel atachment not included.
This durable Fur Eel accessory backer is the perfect mounting piece for easy one handed use of the Fur Eel. The soft latex composition of the Fur Eel let’s it easily conform to its round shape.  It is also a great stand alone nozzle for times your not battling pet hair.  The business end of the tool is near 6 mm thick and will wear for 100’s of jobs in the future. 
It doubles as an adapter for both 32 mm and 39 mm applications. The inside is 32 mm (inside diameter) fitting most home central vacuum systems, upright vacuums with a hose and many shop wet dry vacs too. The 39 mm (outside diameter) is perfect for most other applications like shop and garage vacuums, professional shops and even car washes.