Which NSTM should be referenced for information on O-rings?

The referenced NSTM for information on O-rings is 078, which specifically covers guidelines and technical information related to sealing components and their applications. This includes details on material selection, maintenance practices, and installation procedures for O-rings, ensuring they function effectively in various environments. Understanding the specifications outlined in NSTM 078 is crucial for personnel involved in the maintenance and repair of systems that utilize these critical sealing devices, as it directly impacts the reliability and safety of undersea equipment.

In contrast, the other options may pertain to different aspects of naval standard technical manuals related to other types of components or systems, but they do not focus specifically on O-rings. Thus, for comprehensive knowledge on this topic, referencing NSTM 078 is essential.