From Scuzz stated previously in another post, I would not install an Outerwear since due to the oil, it would stick to the oil and might cause more problems than anything else due to dirt sticking to the Outerwear and not letting the filter breath properly. I would suggest the EHS lid which I have and works great. Previous of Scuzz report, I look for an Outerwear that would fit the Uni filter and could not find one since it's so big 6" X 6.5" and the biggest one I found was 6x6