I removed a half wall when I remodeled my kitchen. The sink drain pipe was inside this wall. The drain went through the floor, but it also had a high loop in it, looping back on itself (about a 3-foot high loop). I assume this loop relieves air pressure in the pipe . I am now in the process of rerunning the drain from the new sink location. My question is, can I simply run the drain through the floor to the existing drain pipe, or do I need to create a loop? Thanks...
Tim
Tim