• 25-627021 Mercury MerCruiser O-Ring | Genuine Quicksilver OEM Part
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25-627021 Mercury MerCruiser O-Ring | Genuine Quicksilver OEM Part

25-627021 Mercury MerCruiser O-Ring | Genuine Quicksilver OEM Part

$2.80 AUD
$2.80 AUD
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✓ Authorised Volvo Penta Dealer · Marine & auto specialists · Ships Australia-wide

🔧 Product Description

Genuine Quicksilver Temperature Sensor O-Ring - Part Number: 25-627021

A genuine Quicksilver O-ring used on Mercury, Mariner and MerCruiser temperature sensor / sender sealing locations. This .301" x .070" O-ring replaces earlier 25-62702 and is commonly used across selected 20HP to 400HP Mercury / Mariner outboards and MerCruiser petrol engines where specified.

⚙️ Key Features

  • Genuine Quicksilver OEM O-ring
  • Correct Mercury part number 25-627021
  • Supersedes 25-62702
  • .301" x .070" O-ring size
  • Commonly used on temperature sensor / sender assemblies
  • Cross-references with WSM 526-08 temperature sensor O-ring applications

🚤 Compatibility

Commonly used on

  • Mercury / Mariner temperature sensor and sender locations
  • MerCruiser temperature sensor and sender locations
  • Small O-ring sealing points where 25-627021 is specified

Typically suits

  • Engine models:
  • Mercury / Mariner 20HP outboard temperature sensor applications where 25-627021 is specified
  • Mercury / Mariner 25HP outboard temperature sensor applications where 25-627021 is specified
  • Mercury / Mariner 40HP outboard temperature sensor applications where 25-627021 is specified
  • Mercury / Mariner 50HP outboard temperature sensor applications where 25-627021 is specified
  • Mercury / Mariner 60HP FourStroke / EFI applications where 25-627021 is specified
  • Mercury / Mariner 75HP through 300HP outboard sensor sealing applications where specified
  • Mercury 400HP outboard sensor sealing applications where 25-627021 is specified
  • MerCruiser 350 Scorpion - serial 0W698433 and up where O-ring 25-627021 is specified
  • MerCruiser Scorpion 350 EC - serial 0W698433 and up where specified
  • MerCruiser Scorpion 377 - serial 0W698433 and up where specified
  • MerCruiser Scorpion 377 HO EC - serial 1A091488 to 1A092170 where specified
  • MerCruiser petrol engine temperature sensor / sender applications using O-ring 25-627021
  • HP Range: commonly 20HP - 400HP outboard applications where specified, plus MerCruiser petrol engines where specified
  • Engine Type: Mercury / Mariner outboard and MerCruiser petrol engine
  • System Type: Temperature sensor / sender O-ring
  • O-Ring Size: .301" x .070"

🔌 Function

The O-ring seals the temperature sensor or sender to prevent water, coolant or fluid leakage around the sensor body while maintaining the correct sensor seating depth.

⚠️ Common Signs of Failure

  • Water or coolant seepage around temperature sensor
  • O-ring flattened, cut or swollen
  • Sensor removed and O-ring disturbed
  • Corrosion around sensor bore
  • Temperature sensor service requiring reseal
  • Incorrect O-ring causing sensor leak or poor fit

🔄 Supersession & Cross Reference

OEM Supersession Chain

  • 25-627021 → Supersedes 25-62702
  • 25-62702 earlier OEM O-ring reference
  • F50342 earlier Force / Mercury reference where specified

OEM / Related Numbers

  • 25-627021
  • 627021
  • 25-62702
  • 62702
  • F50342
  • Mercury 25-627021
  • Quicksilver 25-627021
  • Temperature sensor O-ring
  • Sender O-ring
  • .301 x .070 O-ring

Aftermarket / Verified Equivalents

  • WSM: 526-08
  • WSM: 526-08A1
  • Aftermarket temperature sensor O-ring equivalents exist where matched to 25-627021 / 25-62702

📦 Condition

  • Genuine Quicksilver part
  • Brand new
  • Supplied in original or equivalent packaging

Shipping & Delivery

Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.

Returns & Warranty

14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.

Not sure this fits?

Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.

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