Double-click the element in the 3D view
Select the
element and press the 
Toolbar icon
Reducers can only be placed on straight lines, and only if adjoining elements have a different diameter. The reducer weight is modeled as uniform load. The pipe part weight that covered by reducer is removed. Insulation and fluid weight is the average value of the weight from two connected pipes. Snow, ice, wind, and user defined uniform loads are got as average value from two connected pipes. There are several reducer types:
To insert a bend, select the desired node and use the menu option: Insert > Insert Reducer
To view properties of an existing element:
Double-click the element in the 3D view
Select the
element and press the Toolbar icon