A damaged, warped, or missing heat manifold can cause uneven heating, hot spots, inefficient pellet use, and inconsistent cooking results. The 9904200045 manifold kit restores proper heat flow and distribution, helping your smoker maintain set temperatures and deliver consistent, reliable performance across the cooking grate.
Heat manifold kit (base) engineered for Gravity 800 smokers
Channels heat and smoke for balanced cooking
Durable metal construction designed for high-heat performance
Critical for consistent temperature and airflow control
OEM part engineered to match original specifications
Fits Masterbuilt Gravity 800 pellet smokers
Fits most Gravity 800 configurations—confirm your model before ordering.
Fits Models
MB20040122, MB20040221
Power Off & Cool: Ensure the smoker is unplugged and fully cooled before beginning.
Access Firebox: Open the access panel or firebox area to reach the manifold location.
Install Manifold Kit: Position the heat manifold base into place and secure using existing mounting points and hardware.
Refer to your smoker’s manual for specific alignment and torque specifications.
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1. Does this fit my grill?
Yes — this heat manifold kit is designed for Masterbuilt Gravity 800 pellet smokers. Confirm your model number before ordering.
2. What is this part made of?
It’s constructed from durable, high-temperature metal engineered for directing heat and smoke inside the smoker.
3. How long should this part last?
With proper installation and normal use, this manifold kit should last many grilling seasons.
4. How do I install it?
After unplugging and cooling the smoker, open the access panel, remove the old manifold, and secure the replacement in place using original mounting points.
5. Why choose this replacement part over others?
This is a genuine Masterbuilt OEM part engineered specifically for the Gravity 800, ensuring precise fit, optimal heat distribution, and long-term reliability compared to generic alternatives.
"I've been using my Masterbuilt Gravity Series 800 grill since 2021, and after extensive use, some parts started to rust. Unfortunately, Masterbuilt doesn't offer these parts on their website. However, I found exactly what I needed on this site! The replacement part was identical and worked perfectly. I'm extremely satisfied with my purchase and will definitely return to this site for any future needs. Highly recommend!"
