AutoLine Pro automotive cap plugs kit 23-piece set — tapered EVAP & vacuum seals, labeled organizer

AutoLine Pro Premium Automotive Cap Plugs Kit is a 23-piece set of precision-molded plastic plugs designed to seal EVAP, vacuum, and test openings from 1/8" to 4" (3.2–102 mm) so you can perform reliable leak and smoke tests.

This kit supplies a full range of tapered cap plugs engineered for a snug, repeatable seal across common automotive ports, helping technicians and DIYers isolate leaks quickly. The plugs are molded from high-strength plastic for durability and consistent fitment, and they’re compatible with all standard EVAP and vacuum smoke machines including AutoLine Pro, OTC, Redline, Autool and similar units. Backed by a lifetime warranty, the set is sized and labelled to make selection easy on the bench or at the vehicle.

What sizes are included and how do they cover most vehicles?

The 23-piece assortment spans 1/8" to 4" (3.2 mm to 102 mm), covering the small vacuum nipples up to larger hose and port openings found on engines, fuel systems and EVAP canisters. The tapered design creates a tight seal across multiple diameters, reducing the need for multiple single-size plugs.

• 23 plugs sized to nest across a wide diameter range
• Tapered profile for secure seals on irregular openings
• Labelled sizing for fast plug selection during diagnostics

How does this kit work with smoke and vacuum testing tools?

Each cap plug is shaped to close off a port or hose so smoke or vacuum pressure is contained, letting you pinpoint leaks where smoke or pressure escapes. Because the plugs resist deformation, they hold seals under the modest pressures used during EVAP and smoke diagnostics.

• Compatible with all major smoke and vacuum machines
• Durable plastic maintains shape under test pressure
• Helps isolate components quickly to reduce diagnostic time

What makes the material and build quality stand out?

The plugs are made from an engineered plastic formulated for toughness and a consistent outer finish, which helps with repeatable sealing. Their rigid-but-slightly-compressible construction delivers a firm grip without tearing, so they stay reusable even after many service cycles.

• Ultra-durable plastic resists cracking and wear
• Precision molding ensures uniform tapers and fit
• Reusable design reduces recurring replacement costs

How do I organize and store the kit for workshop use?

The set ships in a compact organizer that keeps sizes visible and accessible, letting technicians grab the right plug quickly during a job. Because each plug occupies its own compartment, inventory and restocking are simple to manage.

• Compact case with labeled compartments for each plug size
• Portable for in-bay or mobile service use
• Easy to inventory thanks to clear size markings

Who is this for: The AutoLine Pro Premium Cap Plugs Kit is made for professional mechanics, fleet technicians, and serious DIY enthusiasts who perform EVAP, vacuum or smoke diagnostics regularly. If you need a dependable, wide-ranging plug set that pairs with common diagnostic machines and saves time on leak isolation, this kit provides a durable, lifetime-backed solution suited to shop or mobile service environments.