The trap "especially on a negative pressure AH" depends on the siphon effect to drain, you lose that "some" of that effect with the open T. If you close the T and it will draw/siphon the water all the way to the main drain, you end up having more volume of water drawing the water through the trap. Personally, I never leave any T open for critters to crawl into, a small mouse could get into a 3/4" opening, maybe even a large mouse could. :grin2:
Originally Posted by vstech
The new Pro took the model number and is going to order the proper pan. He then said he would take out the handler, redo all the lines, and then put the handler back in place.
Thanks again for all of your help.