MERCURY 21-30430A8 Check Valve

( Part Type: Valve Check ), ( Manufacturer Part Number: 21-30430A8 )

Review MERCURY Check Valve Assembly

The Mercury 21-30430A8 Check Valve is a high-performance, reliable solution for preventing backflow in marine and industrial applications. This check valve is engineered with a robust design to ensure durability and longevity.

The valve body is made from heavy-duty cast iron, providing excellent resistance to corrosion and wear. The valve features a rubber diaphragm that is both flexible and resilient, allowing it to effectively seal against backflow while remaining responsive to changing flow conditions. The diaphragm is reinforced with a stainless steel core, providing additional strength and preventing deformation over time.

The Mercury 21-30430A8 Check Valve is designed with a self-cleaning, non-clogging inlet strainer that helps to prevent debris and sediment from entering the valve and causing blockages. The valve also includes a drain plug, making it easy to perform routine maintenance and clean-outs.

This check valve is suitable for use with a wide range of fluids, including water, fuel oil, and coolant. It is rated for operating pressures up to 125 psi (862 kPa) and temperatures between -40 F and 250 F (-40 C and 121 C). The valve is also compatible with Mercury's digital and analog engine monitoring systems.

The Mercury 21-30430A8 Check Valve is easy to install, with a simple bolt-on design that requires no special tools or additional hardware. The valve includes a 1/2" NPT inlet and outlet connection, making it compatible with standard hose and pipe sizes. The valve is also available in left-hand and right-hand threading configurations, allowing it to be installed in a variety of applications.

Overall, the Mercury 21-30430A8 Check Valve is an essential component for any marine or industrial system that requires reliable, effective backflow prevention. Its robust design, flexible diaphragm, and easy installation make it a top choice for boat builders, engineers, and maintenance professionals.

The Mercury 21-30430A8 check valve is a commonly used accessory in marine applications for preventing backflow in water cooling systems. Here are some potential pros and cons that may help you make an informed decision about purchasing this check valve.

1. Durable Construction: This check valve is made of brass and stainless steel, making it a robust and long-lasting component for marine use.

2. Easy Installation: The Mercury 21-30430A8 check valve is relatively easy to install, and it can be used with both raw water and antifreeze cooling systems.

3. Automatic Function: The valve is designed to open automatically when water flows in one direction and close when the water flow reverses, helping to prevent damage to the engine or cooling system.

4. Leak-Free Design: The Mercury 21-30430A8 check valve features a leak-free design that helps to maintain the efficiency of the cooling system and prevent water damage.

1. Potential for Corrosion: While the brass and stainless steel construction is durable, it is still susceptible to corrosion in marine environments, especially if the water contains high levels of salt or other contaminants.

2. Limited Size Options: This check valve is only available in one size (1-inch), so it may not be suitable for all applications.

3. Higher Price Point: Compared to some other check valves on the market, the Mercury 21-30430A8 model may be more expensive.

The Mercury 21-30430A8 check valve is a reliable and durable option for preventing backflow in marine cooling systems. Its automatic function and leak-free design make it an effective component for maintaining the efficiency and longevity of the cooling system. However, its higher price point and limited size options may be drawbacks for some users. Ultimately, the decision to purchase this check valve depends on the specific needs and budget of the user.

If you are in need of a high-quality check valve for a marine cooling system and are willing to pay a premium for durability and reliability, the Mercury 21-30430A8 check valve may be a good choice for you. However, if you are on a tight budget or have unique size requirements, you may want to explore other options on the market. It's always a good idea to consult with a marine mechanic or supplier to ensure that you select the best check valve for your specific application.

Details:

Never used part, per case only removed from packaging to showcase product.

part #: 2130430a8 prices

• $26.00-$34.99

specifications vesselveep:

• for makes: Mercury
• part type: Valve Check
• manufacturer part number: 21-30430A8

offer vesselveep:

• started: September 24, 2025
• sold: 0
• quantity: 1
• availability: In Stock
• options: Ship-to-home

seller vesselveep:

• # reviews: 407
• city: Rock Hill, South Carolina
• rating: 100.0%

general vesselveep:

• condition: New other see details
• Parts Accessories > Boat Parts > Other

returns vesselveep:

• paid by: Seller
• time: 30 Days
• policy: Returns Accepted

shipping vesselveep:

• service: UPS Ground
• type: Calculated
• class: Standard
• transit: 3-9 Days
• cost: $0.00
• carrier: UPS

payments vesselveep:

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• wallet: Google-pay
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