Alrighty, the basics: 6 tubes forward, 4 aft. They are bronze 3 piece castings 21.125" inside diameter. The bow tubes are 252" the aft tubes are 276" long. They need flood and drain water from the WRT tanks, 3000 PSI air for torpedo charging and impulse and 200 PSI service air to make all of the swiss watch stuff work and to blow the tubes empty. Some of the main components are the tripping latch, poppet valve, stop cam, interlocks and torpedo setting mechanisms. I hope this in some way makes up for asking a vet on the Torsk where the slide valve was when I toured her sometime in the 1980s. Terry