Two strong neodymium magnets hold the funnel on ferrous metal surfaces without slipping. 
Holder collects residual fluids as they drain into the 12 oz. reservoir.
Simply grab and twist the holder to break loose from the surface to pour out any excess fluids. 
Funnel sits slightly angled so it will clear any mounting surface.
Interior ribs prevent the funnel from touching the fluids at the bottom of the holder. 
Made of polypropylene for durability.