Rounded pipe ends for aquarium overflow pipe.

These tulip shaped pipe ends are made for 25 mm and 40 mm pipes to allow for an easier water flow into the overflow pipes. They are both 25 mm tall.

You can use the 3D model which was made in Onshape: https://cad.onshape.com/documents/86077ff6ee2d6032c111bd1c/w/8e7cb5555587712cd57e06a3/e/be398c3fcac98e520bd22de0?renderMode=0&uiState=65c92adccdcb937789a1caf5

The pipe ends are slit to slide onto the plumbing pipes and account for the low tolerance on their diameters.