
S3565 Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $35.99 | Condition is New, Midline Valve Double Shut Expansion Tank Isolator Valve Brass, 1/2 in. MIP x FIP, FREE SHIPPING | 99.6% |
![]() | $109.99 | Top Pick! Condition is New, Midline Premium Brass FIP x FIP Full Port Ball Valve T-Handle 3/4 in. (10 Pack), FREE SHIPPING | 99.6% |

The Midline Valve S3565 Double Shutoff Expansion Tank Isolator Drain is a crucial component in ensuring the optimal performance and protection of heating systems. This product is specifically designed to function as an expansion tank isolator drain, allowing for safe and efficient operation.
The Midline Valve S3565 is a double shutoff design, meaning it features two independent shutoff mechanisms. The first shutoff function is a manual drain valve, which allows for easy and convenient manual draining of the expansion tank. This feature is particularly useful during system maintenance or when the system needs to be bled of air.
The second shutoff function is an automatic air vent. This feature allows for the release of excess air pressure that builds up in the system due to temperature changes. The automatic air vent is designed to open and close based on system pressure, ensuring that the system remains balanced and that no excess pressure builds up.
The Midline Valve S3565 Double Shutoff Expansion Tank Isolator Drain is made from high-quality materials, specifically S3565 alloy, which is known for its durability and resistance to corrosion. This makes the product ideal for use in heating systems that are subjected to harsh environments or high levels of mineral content in the water.
The product is designed with a compact midline configuration, which allows for easy installation and integration into various heating system configurations. The Midline Valve S3565 also features a threaded connection, making it compatible with most standard expansion tank connections.
In summary, the Midline Valve S3565 Double Shutoff Expansion Tank Isolator Drain is a high-performance and reliable product that is essential for maintaining the optimal operation of heating systems. Its double shutoff design allows for both manual and automatic drainage, making it a versatile and convenient solution for system maintenance and pressure management. The product's durability and corrosion resistance make it an ideal choice for use in harsh environments and high mineral content water systems.
Midline Valve S3565 Double Shutoff Expansion Tank Isolator Drain: A Comprehensive Analysis
Introduction:The Midline Valve S3565 Double Shutoff Expansion Tank Isolator Drain is a critical component in heating systems. This device helps prevent damage to the system by isolating and draining air from the expansion tank. In this analysis, we will discuss the pros and cons of purchasing this product to help you make an informed decision.
Pros:1. Double Shutoff Valve: The Midline Valve S3565 comes with a double shutoff valve that provides an extra layer of protection against leaks. This feature ensures that the system remains sealed, preventing potential water damage.
2. Easy Installation: The device is designed to be easy to install, making it a popular choice among DIY enthusiasts. It can be installed on both horizontal and vertical expansion tanks.
3. Effective Air Elimination: The double shutoff valve and the drain function work together to effectively eliminate air from the system, ensuring optimal performance and efficiency.
4. Durable Construction: The product is made of high-quality materials, ensuring durability and long-lasting performance.
Cons:1. Higher Price Point: Compared to other expansion tank isolators, the Midline Valve S3565 comes with a higher price tag. This may be a deterrent for those on a tight budget.
2. Requires Regular Maintenance: The double shutoff valve may require more frequent maintenance to ensure proper function. Failure to maintain the device could lead to potential leaks or system damage.
3. Compatibility Issues: The device may not be compatible with all heating systems, so it is essential to check for compatibility before making a purchase.
Conclusion:The Midline Valve S3565 Double Shutoff Expansion Tank Isolator Drain is an excellent investment for those seeking an effective and reliable solution for air elimination and leak protection in their heating systems. Its durable construction, easy installation, and double shutoff valve make it a worthwhile investment, despite the higher price point and potential compatibility issues.
Recommendation:If you are looking for a high-performance expansion tank isolator with added leak protection, the Midline Valve S3565 Double Shutoff Expansion Tank Isolator Drain is a solid choice. However, it is essential to ensure compatibility with your heating system and budget before making a purchase. Regular maintenance is also necessary to ensure the device functions optimally.
Details:
Installs between expansion tank and air scoop. Measurement system: inch. Midline Valve S3565 double shutoff expansion tank isolator Valve, with drain, brass, 1/2 in. Part number: S3565.
Batteries included?: no. Mop x fop: style: single pack, size: 1/2 in. Batteries required ?: no. Power source: manual.
Brand: Midline Valve, mpn: S3565, upc: 0, ean: 10,: manufacturer: Valve. Color: brass. Material: brass. Allows for easy maintenance of heating system.
specifications yofastener:
- brand: Midline Valve
- mpn: S3565
- part type: Expansion Tank Drain
- upc: 804595108710
- size: 1/2 In.
- style: Single Pack
shipping yofastener:
- type: fixed
- transit: 4-8 days
- class: expedited
- service: expedited
offer yofastener:
- availability: in stock
- started: august 22, 2025
- sold #: 13
- prices: $35.99–$109.99
- item condition: New
- in stock #: 2
- options: ship-to-home
seller yofastener:
- rating: 98.3%
- # reviews: 347
- city: san bernardino, ca
payments yofastener:
- wallet: google-pay
- credit card: discover
- other
general yofastener:
- category: Home & Garden > Building Hardware > Nails, Screws > Fasteners
returns yofastener:
- paid by: seller
- policy: returns accepted
- method: money back
- time: 30 days
Similar To:
- RLC2422: VALVE COUPLING, Midline Valve
- RSC2322-12: VALVE COUPLING BRA, Midline Valve
- RLC2256-12: VALVE COUPLING BRA, Midline Valve
- 947M234: VALVE BALL DRAIN, Midline Valve
- 492T100: WATER VALVE BALL, Midline Valve
- Y12FIP-5: VALVE BALL HANDLE, Midline Valve
- 822T2510: VALVE BALL, Midline Valve
- 822MF234: VALVE BALL, Midline Valve
- 627T223-NL-5: VALVE BALL DRAIN, Midline Valve
- 522T336: VALVE BALL, Midline Valve
- 522C223-5: VALVE BALL, Midline Valve

