S Trap is an S-shaped disposal component that connects to the disposal exhaust elbow to create a water trap (sealer water) to shut out odors and pests. If the smell rises from the disposer, use these S Traps? Is the connection point to the plumbing is sealed? Please check it. The S-Trap is also designed to be easy to clean plumbing and high pressure cleaning when the cap is removed. Please note that the disposal itself does not have trapping function. Developed for this garbage disposal, the S-Trap is streamlined and smooth drainage and is a variable and compact space saving design. Exhaust Elbow 38φ standard, compatible with all disposals.