I need to replace the PVC from the pump to the Valve 2" Multiport Hayward (sp0715all) control. It is leaking where it enters the valve. I don't have it apart yet but I want to pick the pipe fittings up on the way home. I know it uses 2" PVC but the threaded inlet is much larger than that. What size is that opening so I can pick up the right reducer to connect it to the 2" line?