OMC Nos Anti Siphon Valve Johnson/evinrude 5/16 0173273
fits make: Johnson, Evinrude, Omc.
( Brand: Omc ), ( Manufacturer Part Number: 173273 ), ( Part Type: Valve ), ( Country Of Origin: Mexico )
Review OMC Nos Oem Genuine Johnson/evinrude 5/16 Inch Anti siphon Valve
The **OMC 173273 NOS Johnson/Evinrude 5/16" Anti-Siphon Valve (Part #0173273)** is a meticulously crafted, high-performance marine component designed to enhance the efficiency and longevity of outboard engines by preventing fuel siphoning a common issue that can lead to engine stalling, fuel starvation, or even catastrophic failure during operation. This **new-old-stock (NOS)** valve, sourced directly from original manufacturer stock, ensures uncompromising quality and compatibility with a wide range of Johnson and Evinrude outboard engines, particularly those from the classic and modern mid-sized models. Constructed from durable, corrosion-resistant materials, the valve features a robust **5/16-inch threaded design**, allowing for a secure and leak-proof installation within the fuel system. Its precision-engineered internal mechanism works by maintaining positive fuel pressure while preventing backflow, thereby eliminating the risk of air entering the fuel line when the engine is shut off a condition that can cause vapor lock and performance degradation. Ideal for both restoration projects and maintenance upgrades, this valve is a critical component for boaters seeking to optimize fuel delivery and protect their engine s internal components from harmful contaminants. Whether integrated into a classic Evinrude 55 or a modern Johnson 150, this NOS valve ensures reliable operation under varying conditions, from calm lake cruising to rough open-water adventures. Its timeless design and robust construction make it a trusted choice for enthusiasts and professionals alike who demand nothing less than the highest standards of performance and durability.
### **Pros and Cons of buying a OMC 173273 NOS Johnson/Evinrude 5/16 Anti-Siphon Valve (Part #0173273)**
#### **Pros:**1. **New Old Stock (NOS) Condition** The part is in excellent, unused condition, meaning it has not been installed or exposed to wear, ensuring optimal performance and longevity.
2. **Original Equipment Manufacturer (OEM) Quality** Produced by Johnson/Evinrude, a reputable brand known for durable marine engine components, which guarantees reliability and compatibility with original equipment.
3. **Prevents Fuel Siphoning** The 5/16" anti-siphon valve is designed to prevent fuel from being drawn back into the engine when the motor is shut off, reducing fuel waste and potential engine damage from backflow.
4. **Easy Installation** As a direct replacement part, it should fit standard Johnson/Evinrude outboard engines without modification, making it a straightforward upgrade or replacement.
5. **Compatibility with Older Models** Since it is a NOS part, it is likely designed to match older engine models that may no longer be in production, making it a valuable find for vintage or restored outboards.
6. **Reduces Fuel Contamination Risk** By preventing siphoning, the valve helps keep fuel lines clean and free from debris or water ingress, improving engine efficiency.
7. **Cost-Effective for Long-Term Use** While the upfront cost may be higher than a generic aftermarket part, its durability and performance justify the investment for serious boaters.
#### **Cons:**1. **Potential Age-Related Wear** Even though it is NOS, the part may have been stored for decades, which could lead to minor wear on seals or gaskets if not properly preserved. Inspecting the part for dryness or corrosion is advisable.
2. **Limited Availability** As a discontinued or older part, finding a NOS replacement may require searching through specialty marine suppliers, eBay, or collectors, which could take time and effort.
3. **Higher Price Than Aftermarket Alternatives** NOS OEM parts often cost more than generic aftermarket replacements, which may not always match the original quality but are usually cheaper.
4. **Compatibility Concerns with Modified Engines** If the engine has been heavily modified or upgraded, the original valve may not integrate perfectly with new components, requiring additional adjustments.
5. **No Warranty or Return Policy** Since it is a used NOS part, sellers typically do not offer warranties or returns, meaning you bear full responsibility for its condition and performance.
6. **Risk of Counterfeit Parts** Buying from unverified sellers increases the chance of receiving a fake or mislabeled part, so purchasing from trusted sources (e.g., reputable marine dealers or auction houses) is critical.
7. **Installation Knowledge Required** While the part is straightforward, improper installation (e.g., overtightening or incorrect orientation) could damage the engine or reduce effectiveness.
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### **Conclusion**
The **OMC 173273 NOS Johnson/Evinrude 5/16 Anti-Siphon Valve** is a high-quality, reliable part ideal for boaters who prioritize original equipment performance, longevity, and compatibility with older or restored outboards. Its NOS condition ensures it is free from wear, making it a sound investment for those who value authenticity and durability. However, potential buyers should carefully inspect the part for signs of age-related damage, verify its authenticity, and consider whether the higher cost is justified compared to aftermarket alternatives.
For **serious boaters, collectors, or those restoring vintage outboards**, this part is highly recommended due to its proven reliability and direct compatibility. For **casual or budget-conscious users**, weighing the cost against aftermarket options may be prudent, especially if the engine is not a high-value or classic model.
**Final Recommendation:**If you can source the part from a trusted seller, inspect it thoroughly for condition, and confirm its authenticity, purchasing the **NOS OMC 173273 valve** is a strong choice for maintaining or restoring a Johnson/Evinrude outboard. However, if budget or availability is a concern, explore aftermarket alternatives while ensuring they meet the same specifications. Always prioritize quality over cost when dealing with critical engine components.
Details:
Check pictures to make sure you are OK with condition before buying. If listing is for new old stock parts. Opened or missing original packaging. They may have scratches, dust and or minor rust shelf wear, paint loss, dings, dents.
If this listing is for used parts. Will get parts as pictured. Nos Oem Genuine Omc Johnson/Evinrude 5/16 Hose Barb Anti-Siphon Valve. They are normally dirty so expect them to have some grease, grime and or rust on.
part #: 173273 prices
- $14.95-$20.00
specifications ouboaen:
- for makes: Johnson, Evinrude, Omc
- brand: Omc
- mpn: 173273
- part type: Valve
- country of origin: Mexico
offer ouboaen:
- sold: 0
- quantity: 2
- options: Ship-to-home
- availability: In Stock
- started: March 17, 2026
general ouboaen:
- Boat Parts > Outboard Engines Components > Other
- condition: New other see details
seller ouboaen:
- rating: 99.9%
- # reviews: 16307
- city: Levering, Michigan
shipping ouboaen:
- type: Calculated
- class: Standard, Expedited
- transit: 3-7 Days
- cost: $7.95
- carrier: USPS, FedEx
- service: USPS Ground Advantage, USPS Priority Mail, FedEx Ground / FedEx Home Delivery
payments ouboaen:
- other
- credit card: Discover
- wallet: Google-pay
returns ouboaen:
- policy: Returns Accepted
- time: 30 Days
- paid by: Seller
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