Bathtub Drain Funnel

Instead of catching the gross hair, divert it around the cross-bars so it doesn't get caught causing a clog. This assumes you have a clean smooth drain that won't catch the hair, the force of the water should be enough to carry the hair away. 43mm diameter, scale as needed for your drain. Install so the V is between the cross bars of the drain, resting on top down in the drain.