The answer to 'pressure regulator slow draining' is that a clogged or malfunctioning pressure regulator is a common cause. The pressure regulator is responsible for controlling the water pressure entering your home, and if it becomes blocked or fails, it can lead to slow draining throughout your plumbing system.
Some common symptoms of a slow draining pressure regulator include low water pressure, water that drains slowly from sinks and tubs, and in some cases, leaks around the regulator. To fix this issue, you may need to clean or replace the pressure regulator, which is a job best left to a professional plumber unless you have experience with this type of repair.