{"id":35,"date":"2025-09-23T04:55:05","date_gmt":"2025-09-23T09:55:05","guid":{"rendered":"https:\/\/plumbing101.i234.me\/wordpress\/?p=35"},"modified":"2026-05-16T05:14:00","modified_gmt":"2026-05-16T10:14:00","slug":"will-a-trap-arm-block-my-dishwasher","status":"publish","type":"post","link":"https:\/\/plumbing101.i234.me\/wordpress\/will-a-trap-arm-block-my-dishwasher\/","title":{"rendered":"Will a Trap Arm Block My Dishwasher?"},"content":{"rendered":"
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Will a Trap Arm Block My Dishwasher?<\/h1>\n

(plumbing101.i234.me)<\/a><\/strong><\/p>\n<\/header>\n

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Question<\/h2>\n

When planning a new kitchen, space gets tight fast.<\/p>\n

Many ask if the sink\u2019s trap arm can block a dishwasher.<\/p>\n

The trap arm is the horizontal pipe from the P-trap to the wall.<\/p>\n

It must slope to the vented drain and still leave room to slide the unit.<\/p>\n<\/section>\n

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Answer<\/h2>\n

No, the trap arm should not block the dishwasher when it stays inside the sink base cabinet. Keep the P-trap and trap arm in the sink cabinet. Route the arm tight to the back wall and into a wall stub-out at the correct height. Bring the dishwasher hose through a high side hole to an air gap or disposal\/tailpiece. Leave the dishwasher bay clear of rigid drain piping.<\/strong><\/p>\n<\/section>\n

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Best-practice layout<\/h2>\n