Volvo Penta Cooling Water Drain Plug Assembly 21114522 | OEM

Volvo Penta Cooling Water Drain Plug Assembly — Part No. 21114522

Brand: Volvo Penta
Part Number: 21114522
Official Part Name: Drain Plug (Cooling Water / Manifold)
System: Engine Cooling System — Manifold and Block Drain Points
Supersedes: 3849500, 3849892

What This Part Does

This is a genuine OEM blue nylon drain plug assembly used to seal the cooling water drain ports on Volvo Penta marine engines. It is designed for the manifold and block drain locations used during service, winterization, and recommissioning. The assembly includes the plug body, O-ring, and a retaining strap/keeper that keeps the plug tethered to the engine so it can't be lost in the bilge during draining.

Compatible Applications

Fitment should always be confirmed against your engine serial number and the correct Volvo Penta parts diagram. This plug is referenced for the following Volvo Penta gasoline engine families:

• 3.0 Series
• 4.3 Series (V6)
• 5.0 Series
• 5.7 Series (V8)
• 8.1 Series (V8)
• V6 Series
• V8 Series

Serial number verification is required — drain plug location and thread spec can vary by production break and manifold version.

When to Replace

• Plug body is cracked, chipped, or deformed
• O-ring no longer seals reliably or shows cracking/flattening
• Retaining strap is broken or missing
• Plug was lost during a previous drain service
• Preventive replacement during annual winterization or spring commissioning

Service Interval

Inspect at every cooling system drain service — typically each winterization and spring commissioning. Replace immediately if the O-ring or plug body shows any sign of wear or damage. These are low-cost insurance against a cooling system leak at the drain point.

Kit Contents

• 1 × Blue nylon drain plug body
• 1 × O-ring (included)
• 1 × Retaining strap/keeper (included)

Weight & Dimensions

• Weight: 0.05 kg (complete assembly with O-ring and strap)
• Compact nylon plug sized for Volvo Penta manifold and block drain ports

Related Parts

• Volvo Penta O-Ring 976018
• Volvo Penta O-Ring 125362
• Volvo Penta O-Ring 975672
• Volvo Penta O-Ring 975315
• Volvo Penta Thermostat Cooling O-Ring 3586514

Installation Notes

• Confirm fitment by engine serial number before installing
• Inspect the drain port seating surface for corrosion or debris before installing the new plug
• Always replace the O-ring — never reuse the old seal
• Hand-tighten only — nylon plugs do not require tools and can crack if over-torqued
• After refilling the cooling system, run the engine and inspect the drain points for leaks before returning to service
• Attach the retaining strap to a fixed point near the drain port so the plug stays with the engine during future drain services

Technical FAQ

Q: My old plug shows part number 3849500 or 3849892 — is 21114522 the correct replacement?
Yes. 21114522 is the current OEM part number that supersedes both 3849500 and 3849892. If your diagram or service record shows either of those numbers, 21114522 is the correct replacement.

Q: Does this come with the O-ring, or do I need to order it separately?
The O-ring and retaining strap are included as part of the assembly. No separate seal kit is required.

Q: Can I reuse the old plug if it looks okay?
The plug body can sometimes be reused if undamaged, but the O-ring should always be replaced during any drain service. Given the low cost of this assembly, full replacement is the recommended practice during winterization.

Parts Desk Insights

This is one of those parts that gets overlooked until it causes a problem. The most common issue is a drain plug that was lost during a previous service — it falls into the bilge and never gets found. The keeper strap on 21114522 solves that. We also see customers who reuse the old O-ring one too many times and end up with a slow weep at the drain port after commissioning. At this price point, replacing the full assembly each season is the right call. Stock a spare if you do your own winterization — you'll be glad you have it.