# 1942682 Mercury MerCruiser Plug | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Welch Plug 1-13/64" O.D. - Part Number: 19-42682

  

A genuine Quicksilver Welch plug used in MerCruiser drive-system and drive shaft housing applications. This 1-13/64" outside-diameter plug is used to close the specified machined opening in MerCruiser drive shaft housings and related drive-system assemblies.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM Welch plug

• Correct Mercury part number 19-42682

• 1-13/64" outside diameter

• Used in MerCruiser drive shaft housing applications

• Cross-references with Sierra, Mallory and GLM replacement plug references

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 19-42682 current OEM service reference

  

OEM / Related Numbers:

  

• 19-42682

• 42682

• 1942682

• Mercury 19-42682

• Quicksilver 19-42682

• Welch plug 1-13/64" O.D.

• Welch plug 1-1/4" O.D. aftermarket listing reference

• 22-42861-1 related pipe plug

• 26-36557 related grommet

• 23-32632 related bushing

• 62104-1 related intermediate shift shaft

• 27-94996Q2 related Alpha drive installation gasket kit

• 26-32511A1 related gearcase seal kit family

  

Aftermarket / Verified Equivalents:

  

• Sierra: 18-4273

• Mallory: 9-78141

• GLM: 22031

  

🚤 Compatibility

  

Commonly used on:

  

• MerCruiser R / MR / Alpha One drive shaft housing assemblies

• MerCruiser drive shaft housing service where Welch plug 19-42682 is specified

• MerCruiser drive-system plug locations in the intermediate shift shaft / water tube / grommet area

  

Typically suits:

  

• Drive / engine models:

• MerCruiser #1 / MC-I drive shaft housing applications where Welch plug 19-42682 is specified

• MerCruiser R drive shaft housing assemblies where 19-42682 is specified

• MerCruiser MR drive shaft housing assemblies where 19-42682 is specified

• MerCruiser Alpha One Gen I drive shaft housing assemblies where 19-42682 is specified

• MerCruiser 120 / 140 - 1967-1969, serial 2062141 to 2791956

• MerCruiser 120 / 140 - 1970-1977, serial 2791957 to 4893634

• MerCruiser 120 / 140 - 1978-1982, serial 4893635 to 6225576

• MerCruiser 160 - 1967-1969, serial 2065190 to 2763441

• MerCruiser 165 - 1970-1977, serial 2763442 to 4890459

• MerCruiser 165 - 1978-1981, serial 4890460 and up

• MerCruiser 225-S - 1974, serial 3856268 to 4200499

• MerCruiser 233 - 1975-1977, serial 4200500 and up

• MerCruiser 470 - 1976-1977, serial 4208730 to 4893934

• MerCruiser 470 - 1978-1982, serial 4893835 to 6225576

• MerCruiser 485 - 1980-1982, serial 4893835 and up

• MerCruiser 888 - 1971-1977, serial 3106717 and up

• MerCruiser 898 / 228 / 250 / 260 - 1977-1982, serial 4782330 to 6225576

• MerCruiser R / MR / Alpha One Sterndrive - 1983-1990, serial 6225577 to 0D469858

• MerCruiser Alpha One SS - 1986-1989 drive shaft housing applications where 19-42682 is specified

  

• Drive Type: MerCruiser #1 / R / MR / Alpha One Gen I drive shaft housing

• System Type: Welch plug / drive shaft housing plug

• Size: 1-13/64" outside diameter

  

🔌 Function

  

The Welch plug closes a machined opening in the drive shaft housing. It helps keep the housing sealed and prevents water, debris or corrosion from entering the plugged cavity.

  

Common signs of failure:

  

• Plug corroded or dislodged

• Water entry into the drive shaft housing cavity

• Plug damaged during housing service

• Corrosion around plug seat

• Replacement required during drive shaft housing rebuild or cleaning

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 11.05 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 11.05 AUD | In stock |

## Images

- 1942682 Mercury MerCruiser Plug | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/1942682-mercury-mercruiser-plug-genuine-quicksilver-oem-part)
> Updated: 2026-07-18