1 - It's common practice in the army/marine corps to use a condom prevent egress of detritis and dirty water into the barrel of a gun that is "designed to fire underwater" ( eg the HK416, or a Glock 17), because it's the weakest point, and most likely to cause a jam. <br>
<br>2 - when building a vacuum pump for a school project, a student I knew used a piece of plastic condom for the "flap valves" ( the moving part of a one-way valve ) as he was unable to find any other suitable material that met the criteria of highly-flexible, and lightweight, and that would create a good seal against a smooth steel surface. It was controvertial, but successful.<br>
<br>Buzz.<br><br><br>