
0063456 Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $45.98 | Top Pick! Condition is New – Open box, Watts 0063456 3/4"N9-CD Dual Check Valve W/Atmoshperic Vent New, shipping cost = $9.69 | 100.0% |
![]() | $96.60 | Condition is New – Open box, Watts 3/4 Dual Check Valve with Atmospherlo Vent N9-CD, FREE SHIPPING | 98.2% |
![]() | $99.95 | Condition is New – Open box, Watts 0063456 3/4"N9-CD Dual Check Valve W/Atmoshperic Vent New, FREE SHIPPING | 99.3% |
![]() | $110.01 | Condition is New – Open box, Watts Regulator N9-CD 34 Dual Check Valve Backflow Preventer, FREE SHIPPING | ![]() |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $31.95 | Condition is New, New Old Stock Genuine Watts 3/4" N9-CD Back Flow Preventer, shipping cost = $11.95 | 100.0% |
![]() | $34.95 | Condition is New, Watts 3/4" N9-CD Dual Check Valve w/ Atmospheric Vent 3/4-N9-CD, shipping cost = $11.35 | 99.9% |
![]() | $59.00 | Condition is New, Watts N9CD Brass Check valve Vacuum Breaker, 3/4" Size Garden hose compatible, FREE SHIPPING | 100.0% |

The Watts 0063456 3/4 NPT Dual Check Valve is a versatile and essential plumbing component designed to prevent backflow in both water supply and hydronic heating systems. This particular model is a dual check valve, meaning it features two independently functioning check valves within a single assembly.
The first check valve is an atmospheric vent check valve, which allows air to enter the system when water is drained, and prevents water from flowing back into the atmospheric vent when the system is pressurized. This feature helps maintain proper system pressure and prevents potential water hammering and noise. The atmospheric vent check valve is designed with a durable, corrosion-resistant body and a flexible diaphragm that ensures reliable performance and long service life.
The second check valve is a standard full-port ball check valve, which prevents backflow of water in the opposite direction. This valve is designed to maintain the integrity of the system by preventing contaminated water from entering the clean water supply. The full-port ball design offers minimal flow restriction, ensuring optimal water flow and efficient system operation.
The Watts 0063456 Dual Check Valve is manufactured with a 3/4 NPT thread connection, making it compatible with standard plumbing applications. Its compact, space-saving design allows for easy installation in various locations throughout the system. The valve body is constructed from brass for superior durability and resistance to corrosion, ensuring a long service life even in harsh plumbing environments.
In summary, the Watts 0063456 3/4 NPT Dual Check Valve is a high-performance, reliable, and versatile plumbing component designed to protect your water supply and hydronic heating systems from backflow and potential contamination. Its dual check valve design features independent atmospheric vent and standard full-port ball check valves, ensuring optimal system performance and long service life. With its durable brass construction, compact design, and easy installation, this valve is an essential addition to any plumbing system.
Pros and Cons of Buying a Watts 0063456 3/4 N9-CD Dual Check Valve (Atmospheric Vent)
Introduction:The Watts 0063456 3/4 N9-CD Dual Check Valve (Atmospheric Vent) is a plumbing component designed to prevent backflow and ensure proper venting in water systems. Like any other product, it has its advantages and disadvantages. In this analysis, we will discuss the key pros and cons to help you make an informed decision about purchasing this check valve.
Pros:1. Dual function: This check valve serves a dual purpose by acting both as a check valve and an atmospheric vent. It eliminates the need to install separate components for these functions, saving time and money.
2. Durable construction: The Watts 0063456 is made of brass material, which is resistant to corrosion and can withstand high water pressure. This ensures a long service life.
3. Leak-free design: The valve features a leak-free design, which helps prevent water loss and potential water damage in your home or building.
4. Easy installation: The check valve comes with a slip-on design, making it easy to install without the need for special tools or extensive plumbing knowledge.
5. Compliance with industry standards: This valve is compliant with various industry standards, including ANSI/ASME A112.19.1-2017, ensuring its quality and safety.
Cons:1. Price: While the dual functionality of the Watts 0063456 check valve is convenient, it may come with a higher price tag compared to single-function check valves or atmospheric vents.
2. Size and compatibility: This particular model is suitable for 3/4 inch pipes, so it may not be compatible with other pipe sizes. Make sure to check the dimensions and compatibility before purchasing.
Conclusion:In conclusion, the Watts 0063456 3/4 N9-CD Dual Check Valve (Atmospheric Vent) offers several advantages, including dual functionality, durable construction, leak-free design, ease of installation, and compliance with industry standards. However, it may come at a higher cost and may not be compatible with all pipe sizes. Ultimately, the decision to purchase this check valve depends on your specific plumbing needs and budget.
Recommendation:If you require a check valve and atmospheric vent for a 3/4 inch pipe and are willing to invest in a high-quality, durable, and convenient solution, the Watts 0063456 3/4 N9-CD Dual Check Valve (Atmospheric Vent) is a great option to consider. However, if your budget is limited or you need a check valve or atmospheric vent for a different pipe size, you may want to explore alternative solutions.
Details:
The watts 3/4 N9-CD dual check valve with atmospheric vent is a new product designed for hvac and refrigeration systems in commercial industrial settings. Overall, this watts check valve is a valuable component for maintaining the efficiency and safety of hvac refrigeration systems. This check valve is essential for preventing back flow and ensuring the proper functioning of system. With its atmospheric vent feature, it helps regulate pressure and maintain optimal performance.
specifications maxohvac:
- brand: Watts
- mpn: 0063456
- model: 3/4n9-cd
- part type: Valve
offer maxohvac:
- best offers: true
- options: ship-to-home
- prices: $31.95–$110.01
- item condition:
- New – Open box
- New
- started: march 12, 2025
- in stock #: 5
- sold #: 20
- availability: in stock
shipping maxohvac:
- transit: 3-9 days
- type: calculated
- carrier: usps
- class: standard
- service: usps ground advantage
returns maxohvac:
- policy: no returns
payments maxohvac:
- other
- credit card: discover
- wallet: google-pay
seller maxohvac:
- rating: 0.0%
- city: moncks corner, south carolina
- # reviews: 0
general maxohvac:
- category: Business & Industrial > Hvac Refrigeration
Also Viewed:
- 89S-101: WATER INTERNAL LEVEL CONTROL FLOAT, Watts
- 2000MS: FLOW VALVE, Watts
- 098268475050: COOLER VALVE KIT TUBE, Watts
- 3-4-L100XL-3-150: VALVE, Watts
- 007-M1-1-1-2-2-2ND: KIT, Watts
- 0792025: VACUUM, Watts
- 0590719: FLOAT, Watts
- 0061651: VALVE, Watts
- N45B-M1-3-4: PRESSURE REGULATOR, Watts
- 0009493: PRESSURE VALVE, Watts
- 0036046: VALVE SEAT, Watts







