Mercury Quicksilver Bleed Hose Check Valve 21-91933 Outboard Engine Part
91933
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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.
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| Superseded Part Numbers | 21-426233, 21-426232 |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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