Men's Clothing

The Best Automotive Replacement Engine Radiator Drain Cocks

1 min read WeKompare Editorial Team Products verified: July 18, 2026 10 products compared

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Maintaining your vehicle's cooling system is crucial for preventing overheating and engine damage. The radiator drain cock, though small, plays a vital role in facilitating coolant flushes and replacements. Selecting a durable and compatible drain cock ensures efficient system maintenance and longevity.

SaleNo. 1
Dorman 61106 Drain Cock-Brass-1/4 In. NPT Compatible with Select Models
Dorman 61106 Drain Cock-Brass-1/4 In. NPT Compatible with Select Models
  • Direct replacement - this radiator drain petcock matches the fit and function of the original equipment part
  • Durable construction - this part is made of quality materials for a long service life
  • 100 years of experience - Dorman Products has crafted top-tier automotive replacement parts for over a century
  • Quality assured - this petcock has undergone virtual testing to assure proper fit and function
  • Ensure fit - Input your vehicle into the garage tool and check Confirmed Fit bar at the top of the page. If there is an “i” in a blue circle, additional verification is needed. Please hover over the "i" to verify fitment notes match your vehicle
−27% $6.49 Amazon Prime
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No. 2
Dorman 61109 Radiator Drain Cocks Compatible with Select Models
Dorman 61109 Radiator Drain Cocks Compatible with Select Models
  • Direct replacement - this radiator drain petcock matches the fit and function of the original equipment part
  • Durable construction - this part is made of quality materials for a long service life
  • Century of experience - for over 100 years, Dorman Products has provided quality automotive replacement parts to its customers
  • Quality assured - this petcock has undergone virtual testing to assure proper fit and function
  • Ensure fit - Input your vehicle into the garage tool and check Confirmed Fit bar at the top of the page. If there is an “i” in a blue circle, additional verification is needed. Please hover over the "i" to verify fitment notes match your vehicle.
$8.49 Amazon Prime
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No. 3
GM Genuine Parts 22887095 Radiator Drain Plug
GM Genuine Parts 22887095 Radiator Drain Plug
  • Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
  • GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies
$12.15 Amazon Prime
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No. 4
2 Pcs Radiator Petcock Drain Plug Fit for Ford Super Duty 7.3L 6.0L 1999-2007 Replace FOAZ-8115-A
2 Pcs Radiator Petcock Drain Plug Fit for Ford Super Duty 7.3L 6.0L 1999-2007 Replace FOAZ-8115-A
  • Secure Seal: Radiator petcock drain plug engineered with precise threads to provide a tight, leak-resistant seal, maintaining optimal radiator performance and protecting your engine from overheating
  • Durable Construction: radiator petcock drain plug crafted from premium, corrosion-resistant materials, delivers long-lasting strength and reliability, even under high heat and pressure
  • Secure and Stable Fit: Radiator petcock drain plug engineered to stay firmly in place, providing a reliable connection that withstands vibration and normal driving conditions
  • Compatible Models: Radiator petcock drain plug fit for Ford Super Duty 7.3L 6.0L 1999-2007 Replace FOAZ-8115-A
  • Effortless Installation: Designed for quick and straightforward installation, it fits securely without the need for specialized tools, making maintenance easier and faster
$13.99
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No. 5
NewYall Radiator Drain Plug for Ford F150 F250 F350 F450 E150 E250 E350 E450 Edge Escape Escort Expedition...
NewYall Radiator Drain Plug for Ford F150 F250 F350 F450 E150 E250 E350 E450 Edge Escape Escort Expedition...
  • Fits Ford: E150 2005-2014, E250 2005-2014, E350 2005-2019, E450 2002-2019, Edge 2007-2014, Escape 2005-2012, Escort 1997-2003, Expedition 2005-2006, Explorer 2001-2005, 2011-2019, Explorer Sport Trac 2001-2005,
  • Fits Ford F150 2004-2008, F250 2005-2016, F350 F450 F450 2005-2016, Five Hundred 2005-2007, Flex 2010-2019, Focus 2000-2007, Freestar 2004-2007, Mustang 2005-2014,
  • Fits Ford Police Interceptor 2013-2019, Ranger 1993-2008, Special Service Police 2014-2018, Taurus 1996-2007, 2008-2009, 2010-2019, Thunderbird 2002-2005, Transit 2015-2023, Windstar 1995-1998
  • Fits Mercury: Grand Marquis 2003-2011, Mariner 2006-2011, Montego 2005-2007, Monterey 2004-2007, Sable 1996-2005, Tracer 1997-1999
  • Fits Lincoln: MKS 2009-2016, MKT 2010-2016, MKX 2007-2015, Navigator 2005-2006
$14.99
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No. 6
Milton S-614-2 1/8' Compressor Tank Drain Cock - Pack of 2
Milton S-614-2 1/8" Compressor Tank Drain Cock - Pack of 2
  • Replacement part for damaged drain cocks on compressor tanks
  • Turn handle to drain water, close drain cock when water is drained
  • 1/8" male national pipe thread
  • Made in USA
  • Milton is your number 1 source for Quality Air Accessories
  • Since 1943 Milton has been producing Quality Air Accessories
  • Milton covers automotive, industrial, hardware, agriculture, heavy-duty fleet and MRO markets
$6.95 Amazon Prime
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No. 7
GM Genuine Parts 95018599 Radiator Drain Cock
GM Genuine Parts 95018599 Radiator Drain Cock
  • Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
  • GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies
$18.51 Amazon Prime
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No. 8
GM Genuine Parts 13267636 Radiator Drain Petcock
GM Genuine Parts 13267636 Radiator Drain Petcock
  • Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
  • GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies
$14.98
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No. 9
GM Genuine Parts 15781370 Radiator Drain Petcock
GM Genuine Parts 15781370 Radiator Drain Petcock
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
  • Country of Origin: Brazil
$26.34 Amazon Prime
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SaleNo. 10
GM Genuine Parts 42465901 Radiator Drain Petcock
GM Genuine Parts 42465901 Radiator Drain Petcock
  • Offering The Quality, Reliability, And Durability Of Gm Oe
  • Manufactured To Gm Oe Specification For Fit, Form, And Function
  • Gm-Recommended Replacement Part For Your Gm VehicleaS Original Factory Component
  • Part Number: 42465901
−6% $9.64 Amazon Prime
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Last update on 2026-07-18 / Affiliate links / Images from Amazon Product Advertising API

How to Choose the Best Automotive Replacement Engine Radiator Drain Cocks

When to Replace Your Drain Cock

Signs that your drain cock needs replacement include leaks around the valve, difficulty in opening or closing it, or visible corrosion or damage to the material. If the existing drain cock is plastic and has become brittle or cracked, it's a clear indicator for replacement. A seized drain cock can impede essential cooling system maintenance, making prompt replacement necessary.

Frequently Asked Questions

What is a radiator drain cock?
A radiator drain cock, or petcock, is a small valve at the bottom of your car's radiator. It allows you to easily drain the coolant from the system for maintenance.
What materials are radiator drain cocks made from?
They are commonly made from brass, which offers good durability and corrosion resistance. Plastic and aluminum are also used, with plastic being lighter and often more affordable.
How do I know if my drain cock needs replacing?
Signs include leaks around the valve, difficulty operating it, or visible damage like cracks or heavy corrosion. If it's stuck or won't seal properly, it's time for a new one.
How do I install a new radiator drain cock?
Ensure the engine is cool, then unscrew the old one. Clean the port and screw in the new drain cock, ensuring it's snug to prevent leaks. Using thread sealant can help create a better seal.
Does the type of handle matter?
The handle type, whether a lever, wingnut, or screw, primarily affects ease of operation. A lever or wingnut can be easier to turn, especially if the cock is difficult to loosen, but all functional types will seal the radiator effectively.