buse for jacuzzi or pool

Design for my home made jacuzzi as output to empty the water container. STL version is to connect with standart thread of 50/1"1/2 pipe (I'm not sure but something as this https://www.leroymerlin.fr/v3/p/produits/manchon-mixte-pour-piscine-en-pvc-50-1-1-2-e1502206022).

This version is not for bubble (not made today)
This version is not for powerful water jet

To use openscad you need library:
https://www.thingiverse.com/thing:311031