Which device should be used with a disposal on a double bowl sink to direct waste?

Which device should be used with a disposal on a double bowl sink to direct waste?

• A. Baffle tee
• B. Air gap
• C. Tee elbow
• D. S-trap

Answer: (A)

When a garbage disposal is used on a two-basin sink, you need a fitting that directs the disposal’s waste into the drain while preventing backflow between the basins. A baffle tee is specifically designed for this setup. Its internal baffle guides the discharge from the disposal into the vertical drain and helps keep the other basin from pushing wastewater back toward the disposal, which maintains proper flow and reduces cross-flow issues. The air gap is for dishwasher drainage, not for directing disposal waste. A tee elbow just changes direction without controlling flow, and an S-trap can trap and siphon, which is not acceptable in modern plumbing.

When a garbage disposal is used on a two-basin sink, you need a fitting that directs the disposal’s waste into the drain while preventing backflow between the basins. A baffle tee is specifically designed for this setup. Its internal baffle guides the discharge from the disposal into the vertical drain and helps keep the other basin from pushing wastewater back toward the disposal, which maintains proper flow and reduces cross-flow issues. The air gap is for dishwasher drainage, not for directing disposal waste. A tee elbow just changes direction without controlling flow, and an S-trap can trap and siphon, which is not acceptable in modern plumbing.