I purchased this adapter for use with Motive Bleeding on a 10 year old Acura MDX. The lid itself creates a pretty snug fit when needed. However, to lock it in place, you have to turn it halfway, press on the cap while supporting the brake reservoir, and then turn it all the way. Deleting is just the opposite. rotate, pull up, and then rotate fully. To get it working with my Motive Bleeder I didn't try to change the adapter on the lid. Instead I bought a 3/8 ID tube and placed it over theโฆ