Dsnaduo Neoprene Rubber Expansion Plugs 6 Sizes 14pc Kit — Reusable Tapered Seals for 3/4"–1-1/2"

Dsnaduo neoprene rubber expansion plugs are a 14-piece set of resilient, tapered seals designed to close round holes from 3/4" to 1-1/2" (19–38mm) in automotive, marine and workshop applications.

Whether you need a temporary pressure-test seal, a replaceable frost/expansion plug or a quick fix for a worried-over opening, this kit supplies multiple sizes and spare pieces so you can match the exact hole diameter without cutting or permanent modification. The plugs are molded from neoprene rubber for flexibility and chemical resistance, and their expanding taper design compresses into place to form a snug, reusable seal.

How do these plugs stop leaks and hold pressure?

The tapered neoprene body compresses when pushed into a hole, creating friction and a leak-resistant barrier without adhesives. They work as temporary or semi-permanent seals for coolant passages, exhaust test ports, or general holes where a rubber expansion plug will grip the metal edge.

• Expanding taper design for friction-fit sealing
• Neoprene material resists oils and mild chemicals
• Reusable—remove and reinsert for repeated testing or repairs

Which sizes are included and how do I pick the right one?

The set contains six size ranges with 14 plugs total so you can try a close fit and swap if needed. Choose the plug whose listed fit range closely matches the hole diameter; if in doubt, pick the slightly larger range for a firmer compression fit.

• 3 plugs for 3/4"–7/8" (19–22mm)
• 3 plugs for 7/8"–1" (22–25mm)
• 2 plugs for 1"–1-1/8" (25–28mm)
• 2 plugs for 1-1/8"–1-1/4" (28–31mm)
• 2 plugs for 1-1/4"–1-3/8" (31–34mm)
• 2 plugs for 1-3/8"–1-1/2" (34–38mm)

Can I use these for pressure testing or frost plug replacement?

Yes — these neutral, flexible plugs are commonly used during exhaust or coolant pressure tests to isolate sections and detect leaks without soldering or welding. They can also serve as a temporary frost/freeze plug replacement while sourcing permanent parts.

• Suitable for exhaust and coolant pressure testing
• Temporary frost plug substitute until permanent repair
• Easy insertion and removal for repeated testing cycles

What materials and conditions are they compatible with?

Made from neoprene rubber, the plugs tolerate oils, light fuels, and many workshop chemicals better than plain EPDM, while keeping flexibility across typical garage temperatures. They are not intended as permanent high-temperature engine seals or structural metal plugs.

• Neoprene construction for oil and chemical resistance
• Flexible across common ambient and engine-bay temperatures
• Not recommended as a permanent high-heat or structural fix

Who is this for: The Dsnaduo 14-piece neoprene expansion plug kit is made for mechanics, DIY car owners, marine technicians, and workshop professionals who need a ready assortment of reusable rubber plugs for leak checks, temporary frost-plug service, or closing off round openings during maintenance. Keep this kit in your toolbox for fast troubleshooting, pressure tests, or when you need a non-destructive, removable seal that saves time and lets you continue repairs without delay.