Best Engine Radiator Drain Cocks of 2025

Robert Reyes Avatar
Robert Reyes
Last Updated: Jan 8, 2025

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Engine radiator drain cocks are essential components of a vehicle's cooling system. These small valves are typically located at the bottom of the radiator and allow for easy draining of coolant when performing maintenance or repairs. Engine radiator drain cocks come in a variety of sizes and materials to fit different makes and models of vehicles. They are durable and reliable, making them a cost-effective solution for maintaining a vehicle's cooling system. Properly maintaining a vehicle's cooling system can help prevent overheating and extend the life of the engine.

At a Glance: Our Top Picks

Dorman 61134 Radiator Drain Cocks Cover #TOP 1
Dorman 61134 Radiator Drain Cocks
ftb score rating icon 9.8
Dorman Radiator Drain Cocks Cover #TOP 2
Dorman Radiator Drain Cocks
ftb score rating icon 9.7
Dorman 61127 Radiator Drain Petcock Cover #TOP 3
Dorman 61127 Radiator Drain Petcock
ftb score rating icon 9.5

Top 10 Engine Radiator Drain Cocks

#TOP 1

Dorman 61134 Radiator Drain Cocks

61134
Dorman 61134 Radiator Drain Cocks Cover
Dorman 61134 Radiator Drain Cocks Compatible with Select Models

The Dorman 61134 Radiator Drain Cocks is a direct replacement that fits perfectly and functions like the original equipment part. It is made of high-quality materials that ensure long service life and offers original equipment quality at a competitive price. The petcock has undergone virtual testing to assure proper fit and function. To ensure a perfect fit, the user needs to input their vehicle's make, model, and trim level into the garage tool.

What We Like
Direct replacement that fits perfectly and functions like the original equipment part
Made of high-quality materials that ensure long service life
Offers original equipment quality at a competitive price
#TOP 2

Dorman Radiator Drain Cocks

61137
Black
Dorman Radiator Drain Cocks Cover
Dorman 61137 Radiator Drain Cocks Compatible with Select Models

The Dorman 61137 Radiator Drain Cocks is a direct replacement for your original part, featuring durable construction that assures a long service life. It is a cost-effective solution that offers original equipment quality at a competitive price. The petcock has undergone virtual testing to ensure proper function and fit. To make sure it fits your exact vehicle, use the garage tool and input your make, model, and trim level.

What We Like
Cost-effective solution
Quality construction for long service life
Original equipment quality at a competitive price
#TOP 3

Dorman 61127 Radiator Drain Petcock

61127
Dorman 61127 Radiator Drain Petcock Cover
Dorman 61127 Radiator Drain Cocks Compatible with Select Models

The Dorman 61127 Radiator Drain Petcock is a direct replacement for your original equipment part, ensuring proper fit and function. It is made of durable materials for a long service life and is quality assured through virtual testing. Additionally, it can save you money by offering original equipment quality at a competitive price. To ensure fit, input your make, model, and trim level into the garage tool.

What We Like
Durable materials for long service life
Quality assured through virtual testing
Competitive price
#TOP 4

Dorman 61105 Brass Drain Cock

61105
Brass
Klein
Dorman 61105 Brass Drain Cock Cover
Dorman Help! 61105 Brass Drain Cock

The Dorman Drain Cock is a valuable addition to your automotive toolkit. Measuring 5.05 inches in length and weighing only 0.5 pounds, it is compact and easy to handle. This product falls under the category of engine radiator drain cocks, making it essential for effective coolant management. Manufactured in China, it offers reliable performance for various automotive fittings. With the Dorman Drain Cock, you can ensure efficient draining of your radiator, which is crucial for maintenance and repairs. This convenience helps you keep your vehicle running smoothly by preventing potential overheating issues.

What We Like
Compact size
Lightweight design
Essential for coolant management
Reliable performance
#TOP 5

COOLINGBEST Brass Radiator Drain Cock

COOLINGBEST
CoolingSun-1078
COOLINGBEST Brass Radiator Drain Cock Cover
COOLINGBEST Radiator Drain Cock, Universal style Thread NPT 1/4" Brass petcock Drain Plug

The COOLINGBEST Drain Cock is designed for use with aluminum radiators, making it a versatile choice for your vehicle. With its durable brass construction, you can trust it to withstand harsh conditions and provide long-lasting performance. Installation is quick and straightforward, allowing you to get back on the road without hassle. The NPT 1/4-18 threading ensures a secure fit, preventing leaks and ensuring optimal coolant drainage. However, it's recommended to have a professional installer handle the setup, as no instructions are included. If you have any questions or concerns, customer support is available to assist you.

What We Like
Universal compatibility
Durable brass material
Easy installation
Secure NPT threading
#TOP 6

Dorman 61106 Drain Cock

61106
Dorman 61106 Drain Cock Cover
Dorman 61106 Drain Cock-Brass-1/4 In. NPT Compatible with Select Models

Introducing the Dorman Drain Cock, a reliable radiator petcock replacement designed to match your vehicle seamlessly. Its durable construction ensures a long service life, saving you money with its competitive pricing. Quality assurance through virtual testing guarantees proper fit and function. By using the garage tool feature, you can ensure this part fits your specific vehicle model, making installation a breeze.

What We Like
Direct Replacement
Durable Construction
Cost-effective
#TOP 7

X AUTOHAUX Radiator Drain Plug

a23120500ux0259
Black
1.65"x0.79"
X AUTOHAUX Radiator Drain Plug Cover
X AUTOHAUX 2pcs Radiator Drain Plug Radiator Drain Cock for Chrysler 300 2000-2023 for Chrysler Cirrus 1997-2000 No.4644269

The X AUTOHAUX Drain Plug is designed for various Chrysler and Dodge models, ensuring a perfect fit for your vehicle. Made from high-quality plastic, this drain plug is both sturdy and durable, providing a reliable solution for your radiator needs. It serves to securely attach your radiator, enhancing stability during operation. With its original size and exact match, you can easily replace your old plug without any hassle. Just remember to check your vehicle's model and OE number for compatibility before purchasing.

What We Like
Durable plastic construction
Exact replacement fit
Secure radiator attachment
Compatible with multiple models
#TOP 8

Dorman Radiator Drain Cock

61138
Dorman Radiator Drain Cock Cover
Dorman 61138 Radiator Drain Cocks Compatible with Select Ford / Mercury Models

The Dorman Drain Cock is a vital auto part designed specifically for select Ford and Mercury models. With compact dimensions of approximately 13.7 cm in length, 3.6 cm in width, and 2.3 cm in height, it fits seamlessly into your vehicle's radiator system. This single-package product ensures you have everything you need for installation. Originating from Taiwan, it reflects quality and reliability. By using this drain cock, you can easily manage coolant levels, making maintenance simpler and more efficient, ultimately extending the life of your vehicle's engine.

What We Like
Compact size for easy fit
Single package for convenience
Quality from Taiwan
Facilitates coolant management
#TOP 9

Dorman 61104 Drain Cock for Jeep Models

61104
Brass
Dorman 61104 Drain Cock for Jeep Models Cover
Dorman 61104 Drain Cock-Brass-Standard-1/4 In. NPT Compatible with Select Jeep Models

The Dorman 61104 Drain Cock is a durable and affordable replacement for your Jeep's radiator drain petcock. Made of quality materials, this part will serve you for a long time. It offers original equipment quality and has undergone virtual testing to ensure proper fit and function. To ensure fit, you can input your make, model, and trim level into the garage tool.

What We Like
Direct replacement for original equipment part
Durable construction for a long service life
Competitive price saves money compared to original equipment
#TOP 10

Milton S-614-2 Compressor Tank Drain Cock

s-614-2
Pack of 2
Milton S-614-2 Compressor Tank Drain Cock Cover
Milton S-614-2 1/8" Compressor Tank Drain Cock - Pack of 2

The Milton Drain Cock is an essential replacement for damaged drain cocks found on compressor tanks. You can easily turn the handle to drain excess water, ensuring your compressor operates efficiently. Once the water is drained, simply close the drain cock to prevent any leaks. This drain cock features a 1/8" male national pipe thread, making it compatible with most compressor setups. Proudly made in the USA, this product reflects Milton's long-standing commitment to quality air accessories since 1943, serving various markets including automotive and industrial sectors.

What We Like
Easy water drainage
Compatible with most compressors
Durable USA-made quality
Long-standing brand reliability
Buying Guide Image

Frequently Asked Questions (FAQs)

1. Do you need a drain valve on a radiator?

While there is no requirement to have a drain valve on radiators, it is generally recommended to install drain off points on every radiator. This allows for easier maintenance and draining of the system.

2. What are the three types of radiator valves?

There are three main types of radiator valves based on their functionality: Smart valves, Thermostatic valves, and Manual valves. Each type operates differently and offers various features and benefits.

3. What are the different types of drain valves?

Drain valves come in various types, including pneumatic, electric, thermostatic, and manual handles or wheels. The choice of valve technology depends on the specific application and media to prevent failure or clogging.

4. Where must a drain valve be installed?

A drain-off valve should be installed immediately above the internal stop valve. It is the responsibility of the property owner to ensure proper installation. The communication and supply pipes together form the building water service.

5. Where should a drain off valve be installed?

The drain-off valve is typically located on the lowest point of the radiator or pipework. Look for the radiator in your home with the drain-off valve, which is usually close to the ground floor radiators.

6. Can you replace a petcock?

Yes, it is possible to replace a petcock. However, you may also try cleaning the existing petcock and reinstalling it if it is in good condition.

Editor's Notes

During our engine radiator drain cock research, we found 24 engine radiator drain cock products and shortlisted 10 quality products. We collected and analyzed 6,031 customer reviews through our big data system to write the engine radiator drain cocks list. We found that most customers choose engine radiator drain cocks with an average price of $5.65.

The engine radiator drain cocks are available for purchase. We have researched hundreds of brands and picked the top brands of engine radiator drain cocks, including Dorman, COOLINGBEST, X AUTOHAUX, Milton. The seller of top 1 product has received honest feedback from 385 consumers with an average rating of 4.7.

Written by
Robert Reyes Avatar

Robert Reyes is a dedicated writer from San Francisco with a bachelor of degree in mechanics and a bachelor of degree in marketing. He focuses on making some complicated topics simple and enjoys explaining complex and technical things in an easy-to-understand way.