191833 Mercury MerCruiser Drain Plug Washer | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Gearcase Drain Plug Washer - Part Number: 12-191833

A genuine Quicksilver blue sealing washer for selected Mercury, Mariner and MerCruiser lower-unit gear-lubricant drain and vent screws.

The washer seals the 3/8-16 drain or fill plug against the gear housing. It should be replaced whenever the screw is removed because a compressed, split or hardened washer can allow gear lubricant to escape or water to enter the drive.

⚙️ Key Features

• Genuine Quicksilver OEM drain-plug sealing washer

• Correct Mercury part number 12-191833

• Blue composite gasket construction

• Used with common 3/8-16 gearcase drain and vent screws

• Cross-references with Sierra, GLM, Mallory, Recmar, EMP, Volvo Penta and OMC washers

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 12-191833 → Related to 12-191832

• 12-191832 → Related to 12-19183

• 12-19183 earlier OEM gasket reference

• 12-20260 earlier related drain-plug gasket reference

OEM / Related Numbers:

• 12-191833

• 191833

• 12-191832

• 191832

• 12-19183-3

• 12-19183-2

• 12-19183

• 19183

• 19183B

• 12-19183K02

• 12-19183Q02

• 12-20260

Aftermarket / Verified Equivalents:

• Sierra: 18-2945

• GLM: 31170

• Mallory: 9-60101

• Recmar: REC12-191833

• EMP: 445-230

• Volvo Penta: 3852105

• OMC / Johnson / Evinrude: 0300434

• OMC / Johnson / Evinrude: 0307552

• OMC / Johnson / Evinrude: 0311598

• OMC / Johnson / Evinrude: 0500383

• Force: F8077

• Force: F8186

• Force: F50556

🚤 Compatibility

Commonly used on:

• Mercury and Mariner outboard lower-unit drain and vent screws

• MerCruiser sterndrive gear-lubricant drain and fill plugs

Typically suits:

• Drive / engine models:

• Mercury / Mariner outboards approximately 8HP to 200HP using 3/8-16 gearcase screws

• MerCruiser MC-I, R and MR sterndrives

• MerCruiser Alpha One

• MerCruiser Alpha One Gen II

• MerCruiser Bravo One

• MerCruiser Bravo Two

• MerCruiser Bravo Three

• MerCruiser Blackhawk

• MerCruiser TR and TRS drives

• Mercury Racing sterndrives using the corresponding 3/8-16 drain screw

• HP Range: Approximately 8HP - 200HP for applicable Mercury / Mariner outboards

• Drive Type: MerCruiser pre-Alpha, Alpha, Bravo, Blackhawk and TR / TRS

• System Type: Gearcase lubricant drain, fill and vent screw sealing washer

🔌 Function

The washer forms a fluid-tight seal beneath the gearcase screw head, preventing lubricant loss and water intrusion through the threaded drain or vent opening.

Common signs of failure:

• Gear lubricant around the drain or vent screw

• Milky gear oil caused by water entry

• Washer flattened, split or missing

• Drive fails pressure testing at the screw

• Leakage begins after a lubricant change

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging