Flanges toolbar: Slip On 
Victaulic toolbar: Victaulic Flange 
Command line: FLGO
Places a slip-on flange in the X-Y plane. If Auto Gasket 
is turned on, then a gasket is also placed on the flange. For more information, see
Auto Gasket.
last point
Starts the plain end of the flange at the last point of the previously-created component.
Slip on end
Starts the flange at the slip-on end. This option appears when the previously placed component (such as another flange) would logically take the face end as the start point for the flange. Use this option to place the flange in a different location or in the opposite direction.
Face end
Starts the flange at the face end. This option appears when the previously placed component (such as a pipe) would logically take the slip-on end as the start point for the flange. Use this option to place the flange in a different location or in the opposite direction.
What do you want to do?