This is from a submarine set I bought on aliexpress. It's not LEGO but usually the pieces are the same. I'm missing this piece and cannot identify it. Can you guys help me?
If you are looking for the LEGO equivalent of it, it's a Slope, Curved 2 x 2 No Studs, 3 Side Ports Recessed: https://www.bricklink.com/v2/catalog/catalogitem.page?P=44675#T=P