Elbow to P trap in Drainage System (Revit 2014)

We can convert the elbow to P trap direct with the process below:

1. Change the part type of P trap to elbow inside P trap family.

2. Load the family to your project.

3. draw pipe vertical and horizontal with elbow:

4. Change the elbow to P trap from type selector

It will be like this:

But be careful the way of drawing pipes, if you start from left to right it's totally different than right to left:

if you change the above elbows to P trap the shape will be like this:

Why this happen?

If you open the P trap family you will find two connectors, one of them is primary connection, mean this primary will connect first based on your path.

So if you start with path number 1 the primary connector must be on the top side of P trap:

and Path two the primary connection must be on side connection:

and to change the connector to be primary, select the connector then from ribbon and Re-assign it.

Finally I recommend to add two P trap to your project to select one of them during modeling.

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Objects colors in Revit

In Revit MEP we have three type to control on elements color, and the priority as following:
1. Object Style
2. Model VG
3. System type from project browser
4 Filter VG

Starting the default colors come from object style in this sample we will talk about ducts:

If you change the color from VG-Model, the color will change and will override the color from object style:

And if you change the color from the duct system, will override the VG-Model elements

And the color will override if you change it from filter-VG

So the top priority from filter-VG.

And I recommend to change the colors from filter-VG, becuase we can control the element categories to be in this filter.

But if you change it from system, and some people like this, all element in the connected system will change same image below: