Mercury 8M0082321 – Air Fitting | MerCruiser Engine Ventilation Assembly
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Mercury 8M0082321 – Air Fitting | MerCruiser Engine Ventilation Assembly
Part Number: 8M0082321
Brand: Mercury Marine
Official Product Type: Air Fitting
System: Engine Ventilation / Air Line Assembly
About This Part
Mercury 8M0082321 is a genuine OEM air fitting used in MerCruiser engine ventilation and air line assemblies. It provides a secure, leak-free connection point for air or ventilation hoses routed within the engine compartment. This fitting is a direct OEM replacement for applicable MerCruiser engines and is designed to meet Mercury Marine specifications for fit, material, and durability in the marine environment.
This part is a companion fitting to Mercury 8M0082320 – Male Air Fitting, which is used in the same ventilation assembly family on applicable MerCruiser engines.
Compatible Applications
Used in MerCruiser engine ventilation and air routing assemblies. Always verify fitment using your engine model and serial number before ordering — fitting specifications can vary by engine configuration and production range.
- MerCruiser sterndrive engines (ventilation assembly applications)
- MerCruiser inboard engines (ventilation assembly applications)
Confirm the exact application using the Mercury parts catalog with your engine model and serial number before ordering.
Serial Number & Fitment Notice
Small fittings can vary by engine model, configuration, and serial number range. Always confirm 8M0082321 against your engine model and serial number using the Mercury parts catalog before ordering. Do not select by engine family or displacement alone.
Part Number Reference
- Current Part Number: 8M0082321
When to Replace
Replace this fitting when it shows cracking, brittleness, deformation, or when a hose connection at this point is loose, leaking air, or cannot be properly secured. It should also be inspected and replaced any time the surrounding ventilation hose assembly is being serviced and the fitting shows signs of age or heat damage.
Installation Notes
Ensure the replacement fitting is fully seated and any hose clamp or retaining clip is properly secured before returning the engine to service. Inspect the connected hose for cracking or deterioration at the same time — a new fitting on a degraded hose will not provide a reliable connection. Follow Mercury service procedures for the correct installation sequence for the ventilation assembly.
Related Products
Parts Desk Insights
Best Use Case: This fitting is most commonly needed during ventilation hose service, engine compartment rebuilds, or when tracing an air leak in the ventilation system on a MerCruiser sterndrive or inboard. Like its companion fitting 8M0082320, it is a small, low-cost part that is easy to overlook during a larger job — worth having on hand when servicing the surrounding hose assembly so the job doesn’t stall waiting for a minor component.
Common Mistakes: The most frequent issue is ordering without confirming the part number against the Mercury parts diagram for the specific engine serial number. MerCruiser engines of the same family can use different fittings depending on production year and configuration. Because this is an inexpensive part, it is also sometimes skipped during hose replacement — if the hose is being replaced due to age or damage, the fitting should be inspected at the same time and replaced if there is any doubt about its condition.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.