Yes, a catch can with 2 tubes in the bottom. on the inside, the first one is flush with the bottom of the can. The second extends up near the top, maybe 2/3 of the way up. you put the vacuum on the tall one and the oil side on the flush one. Even when oil is pulled in, the tall tube keeps it sucking high and dry. When it is upside down, hopefully you aren't still driving it. When you roll it back over, the most the intake can suck in and dump on top of a cylinder is the volume of the vertical tube if it retained any. Keep the can drained