As other reviews have said the factory grommets are too thick to fit my Chrysler (06' Dodge 2500). I took a stationery knife and cut off the strips a bit. Then he rooted perfectly and made a perfect seal. This is a good quality fiber reinforced plastic tool and fairly durable. I've had another CTA adapter for years and it didn't break because of brake fluid. Would have given 5 stars if it didn't require a bit of shaving to install.