If you leave the "tee type" blank, CAESAR II assumes you are going to enter your own SIF value. If you leave this blank also, CAESAR II uses an SIF of 1.0.

This is typically not what you want to do, which is why when you go through Error Checking this situation produces "Warning 33E". This warning states:

There is a GEOMETRIC INTERSECTION at node "x" and there was NO user defined INTERSECTION TYPE. Standard pipe flexibilities and SIF's = 1.0 will be used unless overridden by the user on each element framing into the intersection.