rnjng.......sounds like the return fitting your talking about is on an aboveground pool.....not an inground. Since one of the parts is cracked......all you need to do is go to you local pool store and purchase a complete return fitting. They are not expensive.....so you may as well buy the complete return.....not just the part that is cracked. Lower the water in the pool to make it easier to install. You may need some clear silicone and teflon tape to complete the install......hope this helps.