Hi AVB,
This is a commercial machine I think he has got hold of it somewhere as he had no idea how it worked and he didn't have a hose to fit the connector. He has brought over pumps previously with either the motor in bits or the pumps in bits. I have not even looked at them I have just taken them to the scrap He picked up one today from here that was not starting and I had fixed that and then he dumps this one on me. I don't know anything about how they work internally so I might just pull the pump off and look around for a replacement pump that will fit if I can