86304, I inspected the leaking valve boots more carefully. Had to deflate the tube to find the problem, but when I did that I discoverd taht I could flex the boot, thep ortion that is glued to the inside of the tube and thus expose the spot where the glue had failed. That done, I scraped out as much old glue as I could, cleaned up with toluene, worked new glue in, and I seem to have it fixed. We'll see if these repairs hold under the stress of boating. And, yes, they are old military style valves.