What distinguishes the MBU-20P from the MBU-20A/P oxygen masks?

The distinction between the MBU-20P and the MBU-20A/P oxygen masks primarily lies in the breathing hose. The MBU-20P is designed with an advanced breathing hose that improves ergonomics and facilitates better performance in a range of conditions compared to the earlier model MBU-20A/P. This enhancement not only contributes to comfort for the wearer but also optimizes the flow of oxygen, ensuring reliable delivery under varying operational demands.

The other options, while they may seem plausible, do not encompass the primary differentiating factor between these two models. The types of filters, oxygen delivery methods, and weight capacities are either consistent across both models or not the main features that distinguish their design and functionality. By focusing on the breathing hose, we recognize the importance of advancements in design that enhance user experience and operational efficiency in aircrew environments.