A few photos from 10 years ago when we helped a department with the change-over from 6-inch threaded to 6-inch cam lock suction fittings. The process was really pretty simple. Because the suction hose was carried in compartment troughs on the pumper, the 10-ft lengths were from threaded coupling end to threaded coupling end. The cam lock fittings are bigger so the hose had to be trimmed some so that the finished product would fit in the troughs. Not sure who is making what these days, but this project back in 2013 used parts and suction hose from Kochek. The FD reports that the hose remains in service today.