PRODUCT DETAILS
IAC / Intake Air Control Solenoid Valve for Mercury & Mariner Outboards
Marine-grade aftermarket IAC / idle air control solenoid valve for selected Mercury and Mariner EFI 4-stroke outboards.
Designed to replace Mercury 877805T.
Fitment
Fits selected Mercury / Mariner EFI 4-stroke applications including:
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40 HP EFI
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50 HP EFI
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60 HP EFI
The 877805T solenoid valve family is also catalogued for selected 30 HP EFI applications.
Please check the original part number and engine serial number before ordering.
Replaces Mercury Part Number
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877805T
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877805T1 – searchable/reference format where catalogued
Additional Cross References
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K5T48471
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K005T48471
Suzuki Cross References
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18117-84380
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18117-84380-000
Johnson / Evinrude Cross Reference
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5031431
Product Features
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IAC / Idle Air Control Solenoid Valve
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Intake air control valve
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Mercury / Mariner applications
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Selected 40 / 50 / 60 HP EFI
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Selected 30 HP EFI applications also use this valve
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4 Stroke
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2-pin electrical connection
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Marine-grade aftermarket replacement
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New in box
What's Included
1 × IAC / Solenoid Valve
⚠️ Important Compatibility Warning
This valve does NOT fit every Mercury / Mariner 30–60 HP outboard.
Mercury used different fuel and air-control components depending on the engine generation and serial number.
Before ordering, please check:
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Original part number
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Engine horsepower
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Engine model
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Complete serial number
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Electrical connector
If the part looks the same as yours, this does not always mean it is the correct part for your outboard.
If unsure, send SSI Marine your engine horsepower + complete serial number and we will help check compatibility.
Buyer Responsibility
It is the buyer's responsibility to confirm compatibility before purchasing.
OEM part numbers are used for identification and reference purposes only.
Correct diagnosis is recommended before replacing EFI components, as wiring, sensors, fuel-system or other engine-management faults can produce similar symptoms.
Why Buy From SSI Marine?
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Marine-grade aftermarket & OEM-spec parts
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Workshop-tested products
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More than 10 years supplying outboard parts
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Same-day dispatch before 1 PM Monday–Friday
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Royal Mail Tracked 24
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UK stock
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Collection from Leigh, Greater Manchester
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Technical support from experienced outboard specialists
SHIPPING & DELIVERY
Delivery & Returns Policy
Delivery
Standard Delivery
- £6: Royal Mail Tracked 24 Service
- £3.99: Large Letter - Royal Mail 1st Class Post (Untracked)
We offer free delivery on all orders over £150 (excludes outboard engines).
Orders placed before 1:00 PM (Monday-Friday) are usually dispatched the same working day.
Most parcels are delivered within 24 hours, but please allow extra time for courier delays that may occur outside our control.
For outboard engines, please contact us for a delivery quote.
Important: Please ensure your shipping address is correct before completing checkout. SSI Marine is not responsible for parcels sent to an incorrect address provided by the buyer.
Tracking Your Order
Once your order has been dispatched, you will receive a tracking number via email (after 5 PM on the day of dispatch).
Tracking is available only for parcels sent via Royal Mail Tracked 24.
Large Letter orders are sent via Royal Mail 1st Class Post (untracked).
Returns
We accept returns of unused and undamaged items within 30 days of purchase.
Returned items must be in sellable condition and include the original packaging.
Please do not tape, label, or write directly on the product's original box.
Important: Do not return items in their original product boxes only, they must be placed inside a protective outer box or bag. Parcels returned like the example below will be subject to a 20% restocking fee.
Return shipping costs are the customer's responsibility.
Please include your order details and reason for return inside the parcel.
Refunds
Refunds are issued for the item purchase price only (shipping costs are non-refundable).
All refunds will be made using the same payment method as your original order.
Items returned in poor condition or without proper packaging may incur a 20% restocking fee.
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