Niches / Dishwasher upper spray arms

Size / fit replacement

Dishwasher upper spray arms: Whirlpool WPW10498900 / WPW10448645 vs Bosch 00745856 / 00676933 vs GE WD22X10050

When the bottom rack comes out clean but the top rack is still dirty, the usual suspect is the upper spray arm (also called the middle, center, or mid spray arm) that hangs under the top rack. Shoppers often order “a Whirlpool upper arm” by brand alone, grab a lower arm by mistake, or miss that one Whirlpool family uses WPW10498900 while another uses WPW10448645. This page helps you read the full dishwasher model, tell the common Whirlpool, Bosch, and GE upper-arm numbers apart, check the cheap seal first, and reorder an Amazon-available arm that prints the part number.

As an Amazon Associate we may earn from qualifying purchases. Product links below are marked PENDING_ASSOCIATES until a Tracking ID is configured — names and search paths are honest; no invented affiliate tag.

Who needs this

• Anyone whose top-rack dishes come out dirty or gritty while the bottom rack is clean
• Whirlpool / KitchenAid / Maytag / Amana / Kenmore owners with a cracked, split, or clogged upper arm who see both WPW10498900 and WPW10448645 online
• Bosch owners not sure whether their model takes 00745856 or the older 00676933 / 00700560 arm
• GE owners who need the upper arm (WD22X10050), not the lower
• People who already replaced the lower arm and now need the matching upper part (see dishwasher lower spray arms)

How to choose (model, upper vs lower, seal vs arm, OEM number)

1. Confirm the arm is the problem. Pull the top rack out, remove the arm, rinse it, and clear the spray holes with a toothpick. Clean the dishwasher filter. Spin the arm by hand. Replace it only if it is cracked, split at the seam, warped, or missing pieces.
2. Check the seal and feed tube first. On many Whirlpool-family models the arm meets the rack feed tube at a white split ring / bearing seal, WP8268433 (replaces 8268433; AP6012237 / PS11745444). It is split by design. A worn seal, a loose connection, or a feed tube that does not line up with the rear water inlet can starve the arm. Some machines also have a diverter that alternates water between the lower and upper arms.
3. Read the full dishwasher model on the label along the tub edge or inside the door rim. For Bosch, note the model plus the slash suffix (e.g. SHE53T52UC/02). Look up that exact model on a parts diagram and copy the upper / middle spray arm number.
4. Upper vs lower vs third (ceiling) arm. The upper arm hangs under the top rack. The lower arm sits on the tub floor. Some Bosch and Whirlpool models also have a small ceiling spray or third-level arm at the top of the tub, which is another separate part. Do not order by photo.
5. Pick the right family. Brand alone is not enough.
   • Whirlpool WPW10498900: upper arm for many WDF530 / WDF540 / WDF560 / WDF730 / WDF750 / WDF760 / WDF775 / WDT710 / WDT720 / WDT770 / WDT780 / WDT790 and Amana ADB1700-class models. Replaces W10498900, W10342777, W10342790, W10342791, W10376692, W10376693, W10850340. Amazon aftermarket B0D95PBR4Y / B0D9GGTRG1-class.
   • Whirlpool WPW10448645: middle arm, about 19" long, gray, for other Whirlpool / KitchenAid / Amana / Jenn-Air models (e.g. ADB1500 / ADB1700 builds). Replaces W10448645, 2312063. Amazon B0D74VNVN4-class (OEM listing) and aftermarket B0B7DTT6J5 / B0DDJFM4DK / B0CR9RFNM4 / B09DT23184-class.
   • Bosch 00745856: upper arm with inlet pipe for many newer Bosch / Thermador 300 / 500 / 800 Series (SHE53T*, SHP65T*, SHXN8U*, SHPM78W*, SHE7PT*-class). Amazon: Bosch OEM B01LY8GUML / B0B5FNN4YJ-class; also sold on the Bosch US parts store.
   • Bosch 00676933 → 00700560: older gray upper arm for SHE / SHX models such as SHE43RL6UC, SHE55M12UC, SHX43P15UC. Bosch lists dark-gray 00700560 as the replacement (with 00700558 as the matching dark-gray lower arm).
   • GE WD22X10050: GE upper wash arm assembly, held on by a nut on the rack supply tube. Amazon B00MOCCGEU / B01BN0DNSG-class. GE lower arm WD22X10047 is a different part.
6. OEM vs Amazon aftermarket. Search Amazon by the OEM number. Genuine arms cost more; aftermarket copies are cheaper but can vary in hub fit and spray-hole pattern. Prefer titles that print the OEM number and list your full model.
7. Lock it in. Whirlpool and GE upper arms often thread on with a retaining nut (turn clockwise to tighten). Bosch upper arms snap onto the rack with a manifold. After install, spin the arm by hand, slide the rack in, and confirm the rack tube lines up with the rear water inlet. PENDING_ASSOCIATES until a Tracking ID is configured.

Comparison criteria (what matters when shopping)

Common product paths (examples only)

These show up often in U.S. shopping. Verify the part number and full model before ordering.

FAQ

Is WPW10498900 the same as WPW10448645?

No. Both are Whirlpool-family upper / middle arms, but they fit different model groups. Look up your full model on a parts diagram and buy the number it lists.

Can I use an upper spray arm on the bottom (or the other way around)?

No. Upper and lower arms have different hubs, lengths, and mounts. Parts sellers note that WPW10498900, for example, cannot be used as a bottom arm.

Bosch 00745856 or 00676933?

It depends on the model and generation. 00745856 covers many newer 300 / 500 / 800 Series models such as SHE53T52UC. 00676933 covers many older SHE / SHX models and has been superseded by dark-gray 00700560. Check your model plus slash suffix.

My upper arm spins and is not cracked, but the top rack is still dirty. Now what?

Clean the spray holes and the filter, check the seal where the arm meets the rack tube, and make sure the rack is pushed fully in so its tube meets the rear water inlet. Some machines alternate water between arms with a diverter, so a stuck diverter can also starve the upper arm.

OEM or Amazon aftermarket?

Search by the OEM number either way. Genuine arms match the hub and spray pattern exactly. Aftermarket copies cost less and work for many people, but pick one that prints the OEM number and your model.

How is this different from the lower spray arm page?

This page covers the arm under the top rack. The lower spray arm page covers the arm on the tub floor under the bottom rack. They are separate parts with separate numbers.

Starter list of real products, brands, and resources

Honest directory notes only — no star ratings, no “best of” claims, no traffic or revenue numbers. Links go to official or primary shopping / education pages. Prices and stock change; verify before buying.

Quick reorder checklist

• Clean the arm, spray holes, and filter first. Replace only if cracked, split, or warped
• Check the seal and rack feed tube (WP8268433-type seal on many Whirlpool models)
• Read the full dishwasher model (plus Bosch slash suffix)
• Confirm upper / middle vs lower vs ceiling arm
• Copy the OEM number: WPW10498900 or WPW10448645 (Whirlpool), 00745856 or 00700560 (Bosch), WD22X10050 (GE)
• Prefer listings that print the OEM number and your model
• Install, spin by hand, and confirm the rack tube meets the rear water inlet