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 the existing silver adapter like some of the other reviewers did. I bought a hose repair kit that included a 3/8 fitting and the necessary clamps. He kept the pressure at 10-15 psi well. All in all it worked great and a much better solution than what Motive is offering for the Honda/Acura.