Here’s photos of the Kindermann Filter Funnel. It fits well into a rubber tank lid that came with a generic tank made in Taiwan (as marked); won’t fall off if tilted, and has stand-offs molded into the attachment area to permit air to flow out/in as liquids are poured in/out. But it will not fit on the lid of a Simmon Omega SS tank — just sits on top so has to be held in place or it will fall over if chems are poured in with any rapidity. Also does not fit my Nikor 220 tank lid.
Instead of using this, I generally use a Paterson Filter Funnel that comes in two parts so a filter paper can be sandwiched between the mating parts; I use filters made from German disposable tea bags (one-time use, obviously).
Sorry if the photos appear before the text — my iPad seems to insist that it be done that way.