OK product, works ok but has its shortfalls
I bought this to replace the one fitted to my daughter's Topper. It has been mass produced to fit into a hull that has a thickness of 9.5mm. Sadly, the two skins that make up the hull of the topper are closer to 11mm so by the time you add even the thinnest of the supplied gaskets (1mm) the bailer face sits approximately 2.5mm under the outer face of the hull. I ended up fitting it using silicon sealant rather than a gasket to reduce the difference. Not very well thought out it my opinion. It is supplied with countersunk screws too which are different from the dome heads on the Topper. They are too short.
Overall, It is expensive for what it is and not great.