Au-ve-co Products 19003 Rubber Vacuum Cap 3/8 Inch

Product Description

The AU-VE-CO PRODUCTS 19003 is a rubber vacuum cap designed to seal open vacuum fittings at 3/8 inch. It blocks vacuum lines that are temporarily or permanently unused, preventing unmetered air from entering the intake system and causing rough idle, lean conditions, or diagnostic fault codes. Made from rubber for a snug, flexible fit over standard 3/8-inch vacuum nipples, this cap is a routine service item used by HVAC technicians, auto mechanics, and equipment service professionals working on vacuum-controlled systems.

This cap fits 3/8-inch vacuum fittings found on automotive engines, HVAC vacuum actuator circuits, and light equipment vacuum systems. It is commonly installed during engine repairs, vacuum system diagnostics, or when a vacuum port is taken out of service. The rubber construction allows the cap to seat tightly without tools, creating a reliable seal that holds under typical vacuum line operating conditions.

Key Features

• Fits standard 3/8-inch vacuum fittings
• Rubber construction provides a flexible, snug seal
• Caps off unused or open vacuum ports to prevent air infiltration
• Lightweight at 0.01 pounds for easy handling and stocking
• Suitable for automotive and HVAC vacuum circuit applications

Compatibility

Designed as an OEM-style replacement vacuum cap for 3/8-inch vacuum fittings in automotive and HVAC vacuum system applications.

Installation Notes

Installation requires no tools - press the cap firmly over the vacuum nipple until it seats completely. Verify the fitting is clean and free of cracks before capping. On vehicle applications, ensure the engine or system is off before servicing vacuum lines. Inspect the cap periodically for hardening, cracking, or loss of elasticity, which can compromise the seal over time.