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Costco 21128 Grill Parts

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Highest quality replacement parts for your Costco 21128 - Free USA shipping $49 or more* - No Sales Tax*

 

Costco 21128 owners manual and diagrams
Diagrams & owners manual not available for grill model# 21128. If you have a manual you're willing to share, please click here to send us an email with the attached manual. Thank You!

 


Replacement gas grill parts for Costco model: 21128
All of the parts we have for Costco 21128 are shown on this page. If the part you need is not shown below, try clicking the appropriate category button on the right side of the page. For example, if your looking for a Flame Tamer/Heat Plate and there are none here, click the Heat Plate button to see all of the Heat Plates we have for Costco grills. You will need to know the dimensions of your existing grids to help you find the right part.

To get the correct Costco 21128 BBQ parts
  • You should measure your existing parts and compare them to what we show here. This is best done with them removed from the grill.
  • Verify your Costco model number by checking the CSA appliance tag on your grill to make sure you have the correct model number. Do not rely solely on the owners manual as these are frequently mixed up at retail stores when the grills are assembled. You'd be surprised at how many folks have the wrong owners manual.
 


21128 Burners

BULL-44305-X5 / BULL-44305-R-X5
Click for photos
44305-R 5-Pack Cast stainless steel burners for Costco model 21128.
  • Replaces original Bull part# 44305
  • Includes adjustable air shutter and screw in the venturi for adjusting air flow.
  • Sold as a set of five (5) burners
Note: The original 44305 burner was a welded stainless steel burner. This replacement burner is a solid cast stainless burner, equivelant to OEM# 16516.

Part Number: BULL-44305-R-X5 (Replaces Costco BULL-44305-X5)
Dimensions: 16 1/4” x 2 7/8”
Material: stainless steel
Weight: 16.25

$422.85
 
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BULL-44305 / BULL-44305-R
Click for photos
44305-R Cast stainless steel heavy-duty burner for Costco model 21128.
  • Replaces original Bull part# 44305
  • Includes adjustable air shutter and a screw in the venturi for adjusting air flow.
  • Sold individually
Note: The original 44305 burner was a welded stainless steel burner. This replacement burner is a solid cast stainless burner, equivelant to OEM# 16516.

Part Number: BULL-44305-R (Replaces Costco BULL-44305)
Dimensions: 16 1/4” x 2 7/8”
Material: cast stainless steel
Weight: 4.0

$99.80
 
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==> All Costco Burners.
 





21128 Cooking Grids

BULL-16517-X5 / BULL-16517-R-X5
Click for photos
16517-R 5-Pack Stainless steel cooking grates for Costco model 21128.
  • SET OF FIVE (5)
  • Premium grade 304 stainless steel
  • Solid stainless rods
NOTE: Some models refer to this part as a Cooking Grid.

This part replaces original BULL part# 16517.



Part Number: BULL-16517-R-X5 (Replaces Costco BULL-16517-X5)
Dimension Front-to-Back: 19 1/2”
Dimension Side-to-Side: 7 1/2”
Material: stainless steel
Weight: 25.00

$366.40
 
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BULL-16517 / BULL-16517-R
Click for photos
16517-R Stainless steel cooking grate for Costco model 21128.
  • Premium grade 304 stainless steel
  • Solid stainless rods
  • Sold individually
NOTE: Some models refer to this part as a Cooking Grid.

This part replaces original BULL part# 16517.



Part Number: BULL-16517-R (Replaces Costco BULL-16517)
Dimension Front-to-Back: 19 1/2”
Dimension Side-to-Side: 7 1/2”
Material: stainless steel
Weight: 5.00

$79.95
 
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==> All Costco Cooking Grids.
 





21128 Heat Plates

BULL-16521-X5 / BULL-16521-R-X5
Click for photos
16521-R 5-PACK Premium grade stainless steel flame tamers for Costco model 21128.
  • Replacement for original Bull part# 16521.
  • Fits Bull-made 4 and 5-Burner grills.
  • One required for each burner.
  • Sold as a set of five (5).


Part Number: BULL-16521-R-X5 (Replaces Costco BULL-16521-X5)
Dimension Front-to-Back: 17 5/8”
Dimension Side-to-Side: 4 5/8”
Material: stainless steel
Weight: 4.5

$192.75
 
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BULL-16521 / BULL-16521-R
Click for photos
16521-R Premium grade stainless steel flame tamer for Costco model 21128.
  • Replacement for original Bull part# 16521.
  • Fits Bull-made 4 and 5-Burner grills.
  • SOLD INDIVIDUALLY.


Part Number: BULL-16521-R (Replaces Costco BULL-16521)
Dimension Front-to-Back: 17 5/8”
Dimension Side-to-Side: 4 5/8”
Material: stainless steel
Weight: .90

$47.13
 
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==> All Costco Heat Plates.
 





21128 Accessories

40259
Click for photos
15” Stainless steel tong.
  • Soft comfort grip
  • Locking mechanism

This part is currently out of stock, but more are already on the way and expected to arrive early July

Part Number: 40259
Dimensions: 15
Material: stainless steel
Weight: 0.14

$9.92
 
Qty
 

==> All 21128 Accessories.
 



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Costco model 21128 - Tuesday, Jun 10 2025

Return to Costco grill parts main page



More Costco grill models we have parts for
720-0070-LP | 720-0077-LP | 720-0083-04R | 720-0108 | 720-0193 | 720-0432 | 720-0709B | 720-0720 | 720-0727 | 720-0733 | 720-0830MB | 720-0896CA | 720-0954G | 730-0954G | 740-0711 | 740-0712 | 780-0832C | 860-0193 | Bread Breaker Two | CGR27 | CGR27LP | CGR30 | CGR30LP | CGR30NG | CGR44 | CGR54 | CS784LP | CS812 | CS812LP | CS892LP | GSC3218WA | GSC3218WAN | GSS2116B-1 | PC-2600L | PC-2600L (pre 2006) | PCA-2600L | PCA-2600L (pre 2006) | SGIR27LP | SGR27LP | SGR30 | SGR30M | SGR30MLP | Steadfast Two | TGR30LP | TGR38 | 1500111 | 1500131 | 2001SS-LP | 210001-LP | Complete list of Costco grill models...



*Orders for Costco grill model 21128 $49 and over ship free to the lower 48 states.
See shipping policy below for more info.


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Build Date: Jun 10 2025