Has anyone used the lightweight 2 1/2 for highrise?
This isn't quite the whole story. The diameter of the hose is directly related to the potential GPM. At the same pressure 2.5" will flow more than 1.75", 1.88", or even 2.25" (haven't seen this yet). Many proponents of the 1.75" line will tell you you can increases the pressure to get 2.5" flows from the smaller line, but wouldn't the same be true of the 2.5". It really isn't even that close.you should check out 1.88 combat hose. i have heard great things about it. you get the gpm's of 2.5 and is easy to control like 1.75