Throttle Control Isolator with Clamp – Fits Mercury Verado 200-400 HP (Replaces 815504256, 8M0113513)
Throttle Control Isolator with Clamp – Fits Mercury Verado 200-400 HP (Replaces 815504256, 8M0113513) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
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Throttle Control Isolator with Clamp – Fits Mercury Verado 200-400 HP (Replaces 815504256, 8M0113513) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Throttle Control Isolator with Clamp is engineered for a direct fit on Mercury/Mariner Verado 6-cylinder 4-Stroke outboards from 200 HP to 400 HP, covering models from 2004 to the present. Also known as an Air Intake Isolator Boot, this component ensures a secure connection for the electronic throttle control (ETC) system.
It serves as a direct replacement for Mercury part numbers 815504256, 8M0113513, 87928815T, 880576005, and 880576T04, providing a reliable solution for maintenance and repair.
- Installs directly with no modifications required.
- Constructed from durable CR (Chloroprene) rubber to withstand the marine environment.
- Includes the necessary stainless steel worm gear clamp for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Mercury | 815504256 |
| Mercury | 8M0113513 |
| Mercury | 87928815T |
| Mercury | 880576005 |
| Mercury | 880576T04 |
Engine & Model Compatibility
Confirm your engine model and year in the table below to ensure accurate fitment.
This component is designed exclusively for the Mercury and Mariner Verado L6 engine platforms listed.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | Verado L6 | 200 | 4-Stroke | 2004–present | 815504256 | All serial ranges |
| Mercury | Verado L6 | 225 | 4-Stroke | 2004–present | 815504256 | All serial ranges |
| Mercury | Verado L6 | 250 | 4-Stroke | 2004–present | 815504256 | All serial ranges |
| Mercury | Verado L6 | 275 | 4-Stroke | 2004–present | 815504256 | All serial ranges |
| Mercury | Verado L6 | 300 | 4-Stroke | 2004–present | 815504256 | All serial ranges |
| Mercury | Verado L6 | 350 | 4-Stroke | 2011–present | 815504256 | Including 350R models |
| Mercury | Verado L6 | 400 | 4-Stroke | 2011–present | 815504256 | Including 400R models |
Technical Specs
- Product Type
- Throttle Control Isolator with Clamp
- Installation
- Direct Fit
- Fuel Type
- Gasoline
- Connection
- Worm Gear Clamp
- Housing Material
- CR (Chloroprene) Rubber with Stainless Steel Clamp
- Housing Color
- Black
- Weight
- Approx. 100g (0.22 lb)
- Fitting Type
- Clamped Connection
- Warranty
- 1 Year (aftermarket)
- Other Technical Attributes
- Also referred to as "Air Intake Isolator Boot with Clamp" or "ETC Intake Boot"
What’s in the Box
- 1 x Isolator-ETC (Replaces 8M0113513)
- 1 x CLAMP Worm Gear (Replaces 815504256)
Installation Notes
- Disconnect the battery terminals to prevent electrical hazards.
- Remove the engine cowling to access the air intake system.
- Locate the existing throttle control isolator boot and clamp assembly.
- Loosen the clamp and carefully detach the old isolator from the throttle body and intake manifold.
- Clean the connection points to ensure a proper seal with the new part.
- Position the new isolator boot and slide the new clamp over it.
- Secure the isolator onto the throttle body and intake, then firmly tighten the clamp. Do not overtighten.
- Reconnect the battery terminals and start the engine to check for air leaks and proper throttle response.
- Replace the engine cowling once the installation is confirmed to be successful.
Troubleshooting & FAQ
How do I know if my throttle isolator needs replacement?
Common signs of a failing isolator include visible cracks, splits, or brittleness in the rubber. Performance issues like an unstable idle, hesitation on acceleration, or diagnostic codes related to air intake leaks can also indicate a faulty seal.
What’s the difference between this and an "ETC Intake Boot"?
They are different names for the same component. This part is often called a Throttle Control Isolator, Air Intake Isolator Boot, or ETC (Electronic Throttle Control) Intake Boot. It serves the same function of connecting the throttle body to the intake plenum.
Will this part fit my Verado 400R model?
Yes, this isolator is confirmed to be compatible with all Mercury Verado L6 engines from 200 HP up to and including the 400 HP models, such as the 350R and 400R, from 2011 to the present.
Is there a recommended replacement interval?
There is no fixed replacement interval from the manufacturer. We recommend inspecting the isolator during routine service (e.g., every 100 hours or annually) and replacing it at the first sign of wear, cracking, or deterioration to prevent air leaks and potential engine damage.
Is this an OEM or aftermarket part?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, with batch inspections for consistency.
How fast do you ship?
We ship worldwide quickly—typical transit is 5–15 days for most regions. Standard shipping is free, and expedited options will appear at checkout where available.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If an issue arises, contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. Please see our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement component, not an OEM part.
- Professional installation is recommended for safety and optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions, typically arriving in 5–15 days.
- Manufacturer-Direct Value — Fair pricing on high-quality components without compromising on materials or quality control.
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