We're doing photocatalysis with the catalyst fixed to a 2" Si wafer, washing an aqueous solution (methylene blue, the concentration varies but in the picture I believe it's 0.1 mMol/l) over the top in beakers that look like this
(the lid is the heatsink for the 365 nm UV LED that drives the reaction; that part is pretty much optimised).
The few we have are custom made, and we need some more. I can't find a source of anything comparable, but I'm only a physicist who doesn't necessarily know what's available or what terms to search for.
It needs two hose barbs as near the bottom as possible, and a flat base wide enough to lift a 2" wafer out (i.e. about a 60 mm minimum internal diameter).
They're also visible in this timelapse video of the reaction.
If such a thing exists, what's it called? Or is there something we could repurpose? Both the cost and the lead time of custom glassware are a bit high.