Clear tub drain with shop vac

After snaking out a tub it's often draining but still going slow - I use a shop vac with a cut off concentration nozzle, plug the overflow valve with a cloth in a plastic bag and force air through the drain to help clear it the rest of the way out.
For those interested here's the link on Amazon to the concentrator nozzle I used: https://www.amazon.com/gp/product/B001MSF19E

Видео Clear tub drain with shop vac канала Jeff Lindborg