Mount for a Wingoneer water level sensor. I use this as an alarm sensor for potential flooding in my basement. The sensor is mounted pointing down into the sump pump well from a plexiglass cover that seals the well off for radon removal. A friction fit cover helps to keep splashed water from causing any false alerts (sometimes we dump dehumidifier water into the sump well for instance).
Note that this mount isn't designed to be super durable & the walls are all around 1.2mm thick but the way it's used won't cause it to be disturbed much at all.
The Fusion 360 design is included along with the STL.
Amazon link to Wingoneer sensor: https://www.amazon.com/gp/product/B06XHDZ3Q4