The size of the output is 3/4". Unfortunately we just do not have any parts for that skimmer anymore. It was discontinued long ago and there is no support for it.
Can I interest you on a new skimmer? I would be happy to offer you a substantial discount on the new skimmer that would bring you the latest technology and warranty for your system. Any particular skimmer you would be interested in? Let me know and I would be happy to quote you a very good price for it.
Let me know,