Final answer:
The diameter of the manway for military tanks cannot be deduced from the information about the hose provided; the data relates to a physics problem concerning fluid mechanics and pressure.
Step-by-step explanation:
The diameter of a manway for military service station tanks is not directly related to the information provided about the hose used over the foundation wall. However, if we consider principles from physics, specifically fluid mechanics, we can deduce some characteristics based on the scenario described where a hose with a 3.00-cm inside diameter rises 2.50 m above the pump and then goes over a wall, losing height, and widens to 4.00 cm in diameter. The pressure at the initial point would be influenced by the elevation above the pump and the diameter of the hose, and as the hose loses height but increases in diameter, the pressure would change according to the principles of conservation of energy (Bernoulli's principle).