I don't recognize it, but I rebuilt an old teleflex and aside from some paper gaskets (which I could have made) it used all standard o-rings that can be ordered from McMaster Carr. If all else fails it might be possible to do a similar job on these.
I initially thought it was a Wagner as they were out of Vancouver where the boat was built. Didn't see anything that looked similar on the Wagner site under legacy pumps.
I may just end up pulling them apart but was hoping to have at least an exploded view first. I'm doing this as a favor but have lots to do on my own boat before I head to Desolation next week. He may need to live with it until I get back end of August.