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Mercury Quicksilver Bleed Hose Check Valve 21-91933 Outboard Engine Part

Mercury Quicksilver Bleed Hose Check Valve 21-91933 Outboard Engine Part

£11.22 GBP
£11.22 GBP
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Mercury Quicksilver Check Valve 21-91933

Premium Bleed Hose System Component

This genuine Mercury Quicksilver Bleed Hose Check Valve (Part Number 21-91933) is a vital component for the recirculation and bleed systems of Mercury and Mariner 2-stroke outboard engines. This "press-in" style valve ensures the correct directional flow of fluids and air, preventing backflow and maintaining optimal engine performance and lubrication.

RELIABILITY: Engineered by Mercury Marine to resist the harsh chemical environments of fuel and oil in marine applications.

Key Features

  • ✔ Direct OEM replacement
  • ✔ Durable press-in design
  • ✔ Essential for 2-stroke bleed systems
  • ✔ Precision-calibrated flow valve

Technical Specs

Manufacturer: Mercury Marine
Part Type: Check Valve
Mounting: Press-In
Material: High-Grade Nylon/Composite

Compatibility / Fitment Guide

Make/System Model/Application Notes
Mercury / Mariner 50hp - 115hp (3-Cyl & 4-Cyl) Fits various 2-stroke models
Mercury / Mariner 135hp - 200hp V6 2-Stroke Bleed hose circuit replacement
Mercury Marine Jet Drive Outboards Verify against serial number

OEM Cross Reference

Mercury / Quicksilver MPN 21-91933, 21-91933 1
Superseded Part Numbers 21-426233, 21-426232

Questions & Answers

Is this a genuine original part?

Yes, this is a genuine Mercury Quicksilver part, ensuring the highest standards of quality and fitment for your marine engine.

How do I know if it is compatible?

We recommend checking the SKU/MPN and Cross Reference list provided above. If your original check valve matches 21-91933 or 21-426233, this is the correct part.

What happens if this valve fails?

A faulty check valve can lead to poor idling, excessive smoking, or oil accumulation in the cylinders. Replacing a clogged or leaking valve restores proper bleed system circulation.

Note: Please verify your engine serial number against the Mercury parts catalog to ensure exact fitment for your specific model year.

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