As explained here, this was created using a linetype and a shape instead of Lisp code.
sorry for a very delayed reply, about 7 months
, I was transfered to another site where internet is kinda limited to officials only. I was hoping this kinda flex in the middle screenshot will do it for me as I worked with tons of HVAC drawings. Anyways I will try CAB's Flex 23. Thanks
Modified my lisp with an option for rounded sides.
Not thoroughly tested, but give it a try.
Thanks CAB, may not be similar to the one in the middle of the screenshot but this will do and thanks for the effort. I will use it