Mercury MerCruiser 3.0L Drain System Adapter Assembly - 22-862605T1
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he Mercury MerCruiser Quicksilver 22-862605T1 is a genuine Mercury Marine OEM drain system adapter assembly used on select MerCruiser cooling-water drain systems. This adapter fitting is part of the engine's multi-point drain arrangement, helping route cooling water through the proper drain hose and fitting network during service, winterization, and storage preparation.
It is commonly associated with select GM-based MerCruiser 3.0L inline-4 engine packages where the factory cooling or drain-system diagram calls for 862605T1 / 22-862605T1.
Key Features
- Genuine Mercury Marine factory OEM drain adapter assembly.
- Mercury/MerCruiser part number: 22-862605T1.
- Alternate formatting: 862605T1 and 22-862605T 1.
- T-style drain-system adapter fitting used where specified by factory diagram.
- Used in select MerCruiser water-drain, manifold, thermostat housing, or cooling hose routing locations.
- Supports proper cooling-water drainage during winterization and seasonal service.
- GTIN/UPC reference: 745061452138.
- Listed dimensions: 2.50 in. L x 1.48 in. W x 0.68 in. H.
- Listed weight: 0.03 lb.
- Replaces earlier Mercury references in supported applications.
Engine Compatibility
Common application context includes select MerCruiser GM inline-4 gasoline engines by serial number, cooling-system layout, and drain-system diagram, including:
- MerCruiser 3.0L GM 181 I/L4 applications where specified.
- Select 3.0L carbureted MerCruiser applications where the drain diagram calls for this adapter.
- Select 3.0L TKS / Turn Key Start applications where specified.
- Select 3.0L MPI EC applications where specified.
- Select manifold, thermostat housing, exhaust intake, or block-drain routing locations where the Mercury/MerCruiser parts diagram calls for 22-862605T1.
Use this adapter only where the Mercury/MerCruiser parts diagram specifically calls for 22-862605T1 / 862605T1.
Serial Number Fitment Notice
Confirm fitment by engine serial number, cooling-system style, drain-system layout, hose routing, fitting location, and exact Mercury/MerCruiser parts diagram before ordering. Similar MerCruiser 3.0L engines can use different drain fittings, hoses, plugs, O-rings, clips, and manifold adapters depending on production range and cooling-system configuration.
When This Part Needs Replacement
Replace this adapter if the original fitting is cracked, brittle, leaking, distorted, missing, or damaged during hose removal or winterization service. It should also be inspected if the engine has cooling-water seepage, a loose drain hose connection, damaged plastic tabs, worn sealing surfaces, or signs of freeze damage around the drain-system fittings.
Installation Notes
Inspect the adapter, hose ends, retaining clips, drain plugs, O-rings, and sealing surfaces before reassembly. Plastic cooling-system fittings can become brittle from heat cycling, age, and winter storage, so avoid forcing the fitting during removal or installation. Replace any hardened or damaged sealing components shown in the same Mercury diagram.
During winterization, confirm that all drain-system passages are open and flowing properly. A blocked or cracked drain fitting can leave water trapped inside the engine, manifold, or cooling passage and may lead to freeze damage during storage.
Alternate/Superseded Part Numbers
- 22-862605T1 — Mercury/MerCruiser formatted part number
- 862605T1 — Mercury base/manufacturer part number
- 22-862605T 1 — alternate printed/catalog spacing reference
- 862605A1 — earlier Mercury reference; verify by serial number and diagram
- 862329 — earlier Mercury reference; verify by serial number and diagram
Parts Desk Insight
Drain-system fittings are small parts, but they are critical during winterization. A cracked adapter or poor seal can prevent the drain system from working correctly or create a water leak once the engine is back in service. Always match the fitting by Mercury part number and engine serial number, then inspect the surrounding hoses and O-rings before closing the system.
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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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