HUB System › Waste Tubing Adapter Image 1 of 3 Image 2 of 3 Image 3 of 3 Waste Tubing Adapter $3.00 Quantity: Add To Cart Added! 3/4 x 1/2 Barbed AdapterThis adapter connects a 3/4” ID hose to our drain hose. 3/4 x 1/2 Barbed AdapterThis adapter connects a 3/4” ID hose to our drain hose.