I've had great luck with other Dorman products but these suck. I've tried 2 of these and they leak. They will seep overnight and cause your vacuum pump to run every morning and sometimes all day, causing unnecessary wear and tear on the vacuum pump. Most people probably don't know or hear how it works. So you won't notice until the pump burns out, costing you even more. As a result, I purchased a genuine Ford part that works great.