Mercury MerCruiser Quicksilver Straight Hose Fitting 3/4 NPT 866725
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Mercury MerCruiser Quicksilver 866725 is a genuine OEM straight hose fitting used in select MerCruiser manifold, elbow, end cap, cooling, and exhaust-related service applications. The full Mercury part reference is commonly listed as 22-866725. This fitting is specified as 3/4 NPT / .750-14 and is commonly used where a straight hose connection is required in the MerCruiser cooling-water or exhaust manifold service layout.
Key Features
- Genuine Mercury Marine / Quicksilver OEM fitting.
- Part number 866725 / 22-866725.
- Straight fitting design.
- Size reference: 3/4 NPT / .750-14.
- Commonly associated with 3/4-14 x 1" hose fitting applications.
- Brass fitting construction is commonly referenced for this part.
- Used in select MerCruiser manifold, elbow, riser, end cap, cooling, and exhaust service layouts.
- UPC / GTIN reference: 745061717046.
- Approximate package size reference: 2.13" x 1.13" x 1.13".
- Approximate package weight: 0.17 lb.
Engine Compatibility
The strongest supportable fitment for 866725 is MerCruiser cooling / exhaust manifold service, not engine fitment by displacement alone.
Commonly associated applications include:
- 2.5L / 120 GM 153 I/L4
- 3.0L / 140 GM 181 I/L4
- 3.7L / 470 / 485 / 488 MCM 224 CID I/L4
- Select GM 305 / 350 V8 MerCruiser applications
- Select 5.0L, 5.7L, 6.2L, 350 MAG, and 377 MAG MPI applications
- Select 7.4L / 454 and 8.2L / 502 big-block applications
- Select Bravo, Alpha, MIE, TR / TRS, and high-performance MerCruiser packages where this fitting is specified
- Select Vazer and emissions-control MerCruiser packages where this fitting appears in the correct service diagram
Because this fitting appears across many MerCruiser engine families, the exact diagram location matters more than engine size alone.
Serial Number Fitment Notice
Verify fitment by exact engine or drive serial number and the correct Mercury MerCruiser manifold, elbow, end cap, cooling, or exhaust parts diagram before ordering. Straight fittings can look similar, but thread size, hose size, material, and service location must match the original diagram callout.
When This Part Needs Replacement
Replace this fitting when the original is corroded, cracked, seized, damaged during removal, leaking at the threads or hose connection, or no longer provides a secure hose fit. It should also be inspected during manifold, elbow, riser, or cooling-hose service.
Installation Notes
Install 866725 / 22-866725 only after confirming the correct service diagram and fitting location. Inspect the hose, clamp, manifold or housing threads, and surrounding cooling/exhaust components before reassembly. Use the correct marine-rated thread sealing method where specified and avoid overtightening into cast components.
Alternate / Superseded Part Numbers
The active Mercury OEM part number for this listing is 866725 / 22-866725.
Related superseded or earlier OEM references include:
- 45084
- 22-45084
- 807155
- 22-807155
- 863804
- 22-863804
Related aftermarket reference sometimes associated with this fitting:
- GLM 13984
Parts Desk Insight
The easy mistake with this fitting is matching only the hose size. On MerCruiser cooling and exhaust assemblies, the correct match depends on the thread size, hose connection, material, and exact diagram location, especially around manifolds, elbows, and end caps.
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Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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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.
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