2.5″ vs 3″ as Attack Line. 3″ is designed & intended as a supply line. Either rig to rig, hydrant to rig, or to supply a master stream device. Anything larger than a 2.5″ is just not a good idea as an Attack Line to move into a building. It’s nearly 30lbs more per 50′ section and much harder to bend. View the photos below where the firefighters hand has a nice grip on the yellow 2.5″, but not so much on the green 3″. The firefighter can easily pick up the yellow 2.5″ with one hand, but a very noticeable difference when grabbing the green 3″ with the same hand. Short video showing the difference.
2.5″ is for ATTACK!
3″ is for SUPPLY!