This adapter is perfect for the brake fluid reservoir on my 2014 Honda Accord and 2008 Honda Fit and provides a good seal with two o-rings As mentioned in a previous comment , however it comes with a fairly large male quick connector which I removed and replaced with a 1/8 NPT M/F elbow and 1/8 NPT - 1/4 barb fitting. The threads on the original port appear to be 1/8 BSP parallel threads which are not compatible with a 1/8 NPT tapered thread. I used a 1/8 NPT faucet to open the threads in the adapter and the added 1/8 NPT fittings bonded very well with the teflon tape.