RoadWorks – DEF Tank Grommet

DEF Tank Grommet

The RoadWorks DEF Tank Grommet (30850-GROM) is a premium black rubber seal designed to provide a secure, leak-resistant mounting point for your DEF (Diesel Exhaust Fluid) tank cap or cover. Built for heavy-duty truck use, this grommet helps maintain a proper seal and prolongs the life of your DEF tank assembly.

Product Features

• Manufacturer: RoadWorks
• SKU: 30850-GROM
• Material: Black rubber (flexible, weather-resistant) for durability under truck-use conditions
• Use: Replacement seal/grommet for DEF tank cap or cover mounting — often paired with RoadWorks cap SKU 30849
• Installation: Press into the tank opening or mount location; ensure proper seating of the cap-or-cover assembly after installation

Performance & Fit

This grommet provides a tight, reliable fit for your DEF tank cap or cover. The rubber material resists chemical exposure, weather, and vibration typical of heavy-duty applications. By maintaining a proper seal, it helps prevent leaks and contamination of the DEF system.

Installation

1. Remove the existing cap or cover from the DEF tank.
2. Inspect and clean the mounting surface and opening—remove any debris or old seal material.
3. Press the RoadWorks grommet into the tank opening or cover mount until fully seated.
4. Install or reinstall the cap/cover assembly and ensure proper closure and alignment.
5. Check for proper seal and absence of leaks after installation.

Why You’ll Love It

• High-quality rubber construction designed for heavy truck use
• Simple, cost-effective upgrade or replacement for worn factory grommets
• Maintains proper DEF tank sealing and system integrity
• Compact, straightforward installation—minimal tools required

Common Questions

• Does this fit only specific truck models? The grommet is designed for DEF tank cap/cover applications and is compatible with many makes and models when paired with the correct cap or cover mounting location.
• Is this a full cap assembly? No — this is only the rubber grommet/seal. The cap or cover is sold separately (see RoadWorks cap SKU 30849).
• Will this rubber material resist DEF chemicals? Yes — the grommet is made from a rubber compound suitable for exposure to DEF fluids, weather, and road vibration.

⚠️ California Proposition 65 Warning:This product can expose you to chemicals including nickel and chromium compounds, known to the State of California to cause cancer and reproductive harm.For more information, visit www.P65Warnings.ca.gov.

Note: Before installation, verify the tank cap or cover mounting location and confirm that the grommet’s dimensions match your tank opening. Proper seating is essential for leak-free operation.