As described, the unique dipstick connection creates an airtight seal that facilitates the oil extraction!
I recently bought this for flushing the twin Mercury 300 V8 engines on my boat, and I honestly wish I had found it sooner. Using the factory flushing port was always awkward and time-consuming, especially with twin engines. This makes the whole process incredibly quick, easy, and hassle-free. It fits perfectly, saves a lot of time, and makes engine flushing something I no longer dread after every trip. Excellent quality and definitely worth every penny. Highly recommended for anyone with outboard engines!
Super convenient, easy to install. It just works, snap on and flush. No more fighting with screwing/unscrewing.