TBI Test Adaptor for Duke etc. (Page 2/2) jelly2m8 JUL 11, 09:51 PM quote Originally posted by theogre: Update: you can get 2 types of them @ amazon using search for "tbi fuel pressure tester adapter" Above Adapter is sold under "OEMTOOLS GM RBI Adapter" and isn't a Ogre Typo but how it is listed and labeled. https://www.amazon.com/OEMT...dapter/dp/B07CWW4ZQT And Does Not have an external retainer ring that needs "pin pliers" to remove them as shown. Just a cheap simple snap ring. New they are tight but if they have wrong seal type the valve body will leak soon as gas shrinks the o-rings. Is cheaper but expect to use 1 time... That's a nice piece of kit, sure wish I had that many years ago. theogre JUL 12, 08:29 AM They can work but better to use the other 1 that replace the fuel filter. Because the internal o-rings often fail if you leave it in for a day or three, or next time you use it. Neither are permanence "fixes" to have on the car.