Autodesk Revit MEP

[#1]

Good evening,

I'm working on an automatic fire sprinkler system in Revit MEP.  Typically, these systems do not use pipe sizes smaller than 1".  As such, in Mechanical Settings, I deleted these sizes for all materials, connections, and schedules/types.

However, when I try to automatically connect a sprinkler with a 1/2" connector (using the Generate Layout and Connect Into tools) into a pipe, Revit still uses 1/2" pipe.

The heirarchy I'm trying to achieve:

sprinkler --> 1/2" x 1" reducer --> 1" pipe

But instead I get:

sprinkler --> 1/2" pipe

How can I permanently delete 1/2" pipe?

Thanks for your assistance.

[#2]

I think I know what the issue is here. If you delete the pipe size you may not be able to connect as REVIT will not recognize the size. The easiest way s to use the space bar when you connect & then once you inherit size & elevation you can change to 1". Unless they are all the same height & if that is the case I would punch in 1" & the height, then just connect & go.