Sierra 18-2374 Magnetic Drain Screw, M8-1.25 Thread, Replaces 688-45341-00-00

The Sierra 18-2374 Magnetic Drain Screw is a magnetic drain plug sized for M8-1.25 thread applications, designed to capture ferrous metal particles as oil drains from the engine or gearcase during a fluid change. The built-in magnet helps trap fine metal shavings that can otherwise recirculate through the lubrication system, giving a quick visual indicator of internal wear when the plug is removed for inspection. It is engineered to meet the demands of high horsepower marine engines and to hold up in the harsh marine environment, meeting or exceeding the performance of the original equipment part it replaces.

This drain screw directly replaces OEM numbers 688-45341-00-00 and 688-45341-10-00, and it is designed to be used together with Sierra gasket 18-4698 for a proper sealing surface at installation. Its compact size and standard M8-1.25 thread make it a straightforward swap during routine oil changes or gearcase service on applicable marine engines and drives.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2374
• Thread Size: M8 - 1.25
• Type: Magnetic Drain Screw
• Material: Stainless Steel
• Color: White
• Weight: 0.01 pounds
• Companion Gasket: Sierra 18-4698
• Packaging: Also available as 18-23741-9 (package of 50)

Fitment

• Fits applications using an M8-1.25 thread magnetic drain screw

Replaces (OEM)

• 688-45341-00-00
• 688-45341-10-00

Frequently Asked Questions

What thread size does the Sierra 18-2374 magnetic drain screw use? The Sierra 18-2374 uses an M8 - 1.25 thread, so it is sized for drain openings that take that metric thread pitch.

Does the 18-2374 drain screw replace any OEM part numbers? Yes, it directly replaces OEM numbers 688-45341-00-00 and 688-45341-10-00.

Is the 18-2374 drain screw actually magnetic? Yes, it is a magnetic drain screw designed to attract and hold ferrous metal particles as fluid drains, helping you spot internal wear during oil changes.

What material is the Sierra 18-2374 made from? It is made from stainless steel, chosen for corrosion resistance in the marine environment.

Do I need a gasket with the 18-2374 drain screw? Yes, Sierra 18-2374 is designed to be used with Sierra gasket 18-4698 to seal properly at the drain opening.

How much does the 18-2374 drain screw weigh? The Sierra 18-2374 magnetic drain screw weighs 0.01 pounds.

Is the 18-2374 available in bulk quantities? Yes, the same part is offered as 18-23741-9 in a package of 50 for shops that need multiple units.

Will the Sierra 18-2374 fit the same as the original equipment plug? It is engineered to meet or exceed the performance of the original equipment part it replaces, so it installs and seals the same way as the OEM plug it is designed to replace.

What color is the 18-2374 drain screw? The Sierra 18-2374 magnetic drain screw has a white finish.

Is a gasket included with the 18-2374 drain screw? No, the Sierra 18-2374 is the drain screw itself; the companion gasket, Sierra 18-4698, is a separate part.

Can the 18-2374 be used on both an engine and a gearcase? Any drain opening using an M8 - 1.25 thread magnetic drain screw, whether on the engine block or gearcase, can use the Sierra 18-2374.