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Agreed, the whole thing could be described a "trap", but it feels reversed/upsidedown from a usual trap. I get that there is a weir function and the trapway in the toilet is a great visual comparison (to @LLigetfa 's credit). Yeah, "air trap" does make more sense, I just have a hard time...

Ok, I see it now!

The flow rate through the sand is slow enough that it never fills the whole volume of the 1/2" pipe with water (no slug). The flow to the bottom bucket is a small stream at best. So the water just stops at the bottom of the ID of the horizontal pipe. Yes, the outlet way out-paces the inlet...

Ok, yeah, I can see that. Kudos for technical terms! However, is this really a trap? It's not filled with water to block air. Only the right-side leg with the drilled end-cap would have any standing water once the water level drops below the horizontal pipe. Is there anything that would better...

I got one just like that! The water overflow on a soaking bathtub is on top of this ridge. It's here at Lowes. You can even see the 3 holes. A/S Evolution Tub

Hi, turning to the pros for help finding a good descriptive name for this 1/2-inch PVC horse-shoe-like fixture. This is a 3-stage water filter that my organization developed for use in rural communities in the developing world. It's made from common PVC components, two 5 gallon buckets, and a...