Good to know, Mark and Bill.
I just replaced the thru hull ball valve for the forward head. It was a bear to remove, mostly because of poor access and it had an Octagonal place to put a wrench on it. The flats were so small that I couldn't get a Crescent wrench to hold. I ordered a 1 1/4 " 8-point socket, but it was too big. I then ordered a 1 1/8" 8-point socket from McMaster Carr. It came in 24 hours, and voila! With a 10" extension and a bit of sweat, it came right off. The new ones I ordered have a hex configuration, so normal 6-point socket works.
Kent & Iris