BUSY-CORNER 120 Pieces Rubber Vacuum Cap Assortment 10

BUSY-CORNER 120-piece nitrile rubber vacuum cap assortment packs ten SAE sizes into a plastic case to seal and protect vacuum lines, carburetor ports, and manifold fittings quickly and reliably.

This kit provides a broad selection of commonly used vacuum cap diameters and lengths, organized in a clear storage box labeled for fast size identification. Each cap is molded from flexible nitrile rubber that resists heat and repeated handling, making them suitable for automotive maintenance, emissions testing, and workshop projects where temporary or long-term sealing of tubing and ports is needed.

Which sizes are included and how are they measured?

The assortment contains 120 caps across ten size/length combinations, sized by the cap inner diameter to match tubing outer diameter (OD). Sizes range from 1/8" OD up to 1/2" OD with varying lengths to accommodate short stubs or deeper fittings.

• 15 pcs 1/8" x 9/16" (fits 1/8" OD tubing)
• 15 pcs 3/16" x 9/16" and 15 pcs 3/16" x 1-1/4"
• 15 pcs 1/4" x 9/16" and 10 pcs 1/4" x 1-1/4"
• 10 pcs 5/16" x 9/16" and 10 pcs 5/16" x 1-1/4"
• 10 pcs 3/8" x 1" and 10 pcs 3/8" x 1-1/2"
• 10 pcs 1/2" x 11/16"

How tough are these caps in workshop and automotive conditions?

These vacuum caps are made of durable nitrile rubber, chosen for its flexibility and resistance to moderate heat and oils commonly found in garages. While not rated for extreme industrial temperatures, they hold up well for routine engine bay use, diagnostics, and temporary sealing.

• Nitrile composition resists oil and light fuel exposure
• Flexible walls create a snug fit over corresponding OD tubing
• Repeated on/off use without tearing under normal conditions
• Organized plastic case protects inventory and speeds selection

What common tasks do these vacuum caps help with?

Use the caps for capping vacuum lines during pressure or vacuum testing, sealing off carburetor or manifold ports during maintenance, or temporarily blocking hoses during repairs. They’re handy when isolating circuits for troubleshooting or preventing debris entry during disassembly.

• Seal off vacuum hoses during emission system checks
• Block carburetor/manifold ports when removing components
• Protect open fittings from dirt and moisture in storage or transit
• Provide quick temporary seals while fabricating or routing lines

How do I choose the right cap for my tubing?

Match the cap by its listed inner diameter to the tubing’s outer diameter (OD). If tubing fits tightly over the cap ID, select that cap size; choose a longer cap when you need deeper coverage or extra grip on stubby fittings.

• Measure tube OD with calipers or compare to the labeled kit sizes
• Use shorter lengths for shallow ports and longer lengths for recessed fittings
• If in doubt, pick the next larger size for a firmer push-on seal
• Keep the storage case labeled to avoid repeated trial-and-error

Who is this for: The BUSY-CORNER 120-piece vacuum cap assortment is designed for mechanics, hobbyists, fleet technicians, and DIYers who need a comprehensive, ready-to-use collection of vacuum caps. It’s useful for anyone performing engine diagnostics, emissions testing, vacuum system repairs, or routine maintenance who wants a durable, organized set of seal plugs that save time and protect components.