Best Engine Expansion Plugs of 2026

The Dorman Steel Cup Expansion Plug 34.3mm, 10 Pack is a direct replacement for factory parts on the specified years, makes, and models. It is an ideal solution for replacing original parts that are missing or have failed due to fatigue. Made from quality materials, this part has durable construction, ensuring reliable performance and long service life. The plug is backed by a team of product experts in the United States and over a century of automotive experience. To confirm fit, input your vehicle's make, model, and trim level into the garage tool.

The UOIENRT Hemi Block Plug is designed to replace the 53032221AA part, making it easy for you to find the right fit. It works well with various Dodge Ram models from 2003 to 2014, as well as Charger, Challenger, Magnum, Jeep Grand Cherokee, and 300 vehicles within specific years. Made from durable plastic, this plug is built to last and withstand regular use. Its main job is to block off the MDS valve on engines that don't have a Multiple Displacement System, helping your engine run smoothly without unnecessary parts. This convenience ensures that your vehicle stays in good shape without extra complications.

The Beck/Arnley Engine Plug is designed to perfectly match your vehicle's original parts, ensuring a seamless fit and reliable performance. Made from sturdy rubber or aluminum, depending on your car’s specific needs, this plug is built to last even under tough road conditions. Its durable materials help protect your engine from damage and wear. Plus, the clear plastic packaging lets you easily see and identify all the parts before installation, saving you time and hassle. With this Beck/Arnley Engine Plug, you get a product that’s made to fit right and stand up to everyday driving challenges.

The Dsnaduo Rubber Expansion Plug set includes 14 pieces of plugs for engine expansion. These plugs come in six different sizes that fit hole sizes ranging from 3/4" to 1-1/2". They can be used as replacement rubber expansion plugs, rubber freeze plugs, or exhaust pressure test plugs.

The DUZFOREI Freeze Plug Kit is a high-quality replacement kit designed for Cummins 1989-2007 5.9 Liter 12 valve and 24 valve engines. Made with aluminum freeze plugs, rubber O rings, and stainless steel bolts, this kit ensures durability and long-lasting performance. The installation process is quick and easy, with the plug retainer threaded into the block and the freeze plug installed with hand pressure only. With a torque of 20ftlb, this freeze plug kit can handle big boost, high pressures, and high RPM, making it successful in demanding conditions. With its great performance and easy installation, the DUZFOREI Freeze Plug Kit is a reliable choice for Cummins Dodge Turbo Diesel owners.

The Dsnaduo Rubber Expansion Plug is designed to be a reliable replacement for your vehicle’s engine expansion needs. Sized between 1-3/4 inch and 1-7/8 inch (44mm to 47mm), it fits snugly for efficient sealing, helping you maintain proper engine pressure. Made from durable neoprene rubber combined with steel, this plug offers strong resistance to wear and tear, ensuring a long-lasting solution. The package includes two plugs, so you have a spare on hand or can work on multiple parts. Installation is straightforward, making it easy for you to upgrade or replace without hassle.

The Camotokiit Fill Plug Kit offers a durable solution with its weld-on aluminum bung, providing a strong and secure connection point for your engine expansion needs. The 1-3/8" opening with 1-1/2"-12 threads ensures a precise fit, making installation straightforward and reliable. Its aluminum threaded cap, finished in silver anodized coating, not only protects the opening but also resists corrosion, keeping your engine parts safe over time. With the Camotokiit Fill Plug Kit, you get a sturdy, well-designed component that helps maintain engine performance and longevity.

The Dsnaduo Rubber Plugs come in a set of six, offering you a variety of sizes to fit different hole diameters. With two plugs sized for holes between 3/4" and 7/8", two for holes from 7/8" to 1", and two for holes ranging from 1" to 1-1/8", you can easily find the right fit for your automotive needs. These plugs serve as replacements for rubber expansion, freeze, or exhaust pressure test plugs, making them versatile for various engine tasks. Plus, they are designed for easy installation, helping you save time and effort when working on your vehicle.

The carleef Rubber Freeze Plugs come in six different sizes to fit various hole diameters, making it easy for you to find the right plug for your engine. Each plug features a precise multi-layer design that ensures a secure and tight seal, preventing leaks and protecting your engine components. These plugs are designed to replace old or damaged expansion plugs and help prevent damage caused by freezing and expanding coolant during cold temperatures. Installation is simple—just remove the old plug, clean the area, and secure the new plug with the locking nuts. This makes maintenance quick and hassle-free for you.

The 1409KMT Hemi Block Plugs come in a set of four, designed to replace solenoid block-off plugs on certain Hemi engines. If you own a 2003-2008 5.7L or 6.1L Hemi engine without the Multiple Displacement System (MDS), these plugs will fit perfectly. They are meant to be used instead of the MDS valve, providing a simple solution for engines without this feature. With four plugs included, you get exactly what’s needed for a full engine setup, making installation straightforward and hassle-free.