Review on Allstar Performance ALL40108: Efficient 1 Pint Funnel with Extension - Streamline Your Fluid Transfer Process! by Kyle Herrera

Funnel arrived with extension attached (requires longer box than needed; consider). It took me a minute and looked at the image on the product page again to see that the tapered end of the extension was not properly inserted into the funnel. In fact, there are currents on the funnel and expansion; the latter is screwed onto the former. The fit is fairly snug (having started, I have to use pliers to screw it all the way in) and it's a somewhat malleable plastic, so be careful not to damage the threads. But tightness is good; there are no leaks at all. Overall a good product when put together correctly. :)