Whirlpool Dishwasher Lower Spray Arm Assembly - W10803178

Restore lower-rack wash coverage and cleaning performance with this genuine OEM Whirlpool Dishwasher Lower Spray Arm - W10803178. This lower spray arm rotates during the wash cycle and distributes water across the lower rack to clean dishes more evenly.

W10803178 is a genuine OEM Whirlpool lower spray arm used when the original arm cracks, clogs, or no longer spins and sprays correctly. This is a lower wash arm for select Whirlpool-built dishwashers.

Compatibility: Whirlpool-built dishwasher platforms that call for this exact lower spray arm.

This part commonly replaces previous part numbers including W10605800 and 4283104.

Fits These Brands / Families: Whirlpool-built dishwasher platforms that use this exact lower spray arm. Verify the lower-rack location, center hub style, and part number before ordering.

Compatible Model Examples: MDB4949SDE0, MDB4949SDH0, MDB4949SDM0. These are examples, not every compatible model.

Fitment / What To Verify: Verify the complete dishwasher model number, arm location, hub or support, water-feed connection and mounting style.

Please confirm fitment with your appliance model number before ordering.

Is it time to replace?

• Common Symptoms: Poor cleaning on the bottom rack, weak spray action, or dishes coming out dirty after the cycle.
• Visible/Sensory Cues: Cracked spray-arm body, clogged spray holes, or an arm that no longer spins freely on the lower rack hub.

Pro Tip: Check the filter and lower spray-arm feed area for debris before replacing the arm so restricted flow does not affect the new part.

Technical Specifications

Legacy part number(s)/code(s): W10605800

If you have questions, please message us before ordering so we can address your concerns. Please review our Return Policy before purchasing.

Please note: Check the model diagram for any separate mounts, seals or retainers; the included components can differ by part number.