AN Fitting Dust Caps & Plugs - AN3 to AN20

Keep your project car’s fuel, oil, and coolant lines clean with this comprehensive set of AN (Dash) protective caps and plugs.

Designed for a perfect fit, these are essential for any engine build, K-Swap, or long-term restoration. No more using masking tape or rags to plug your expensive lines—these 3D-printed caps ensure no dust, debris, or moisture enters your sensitive fluid systems while you work.

📦 What's Included?

The set now includes both Male and Female versions for the full range:

• AN3 (Perfect for brake/clutch lines)
• AN4
• AN6
• AN8
• AN10
• AN12
• AN16
• AN20 (Ideal for main radiator hoses)

🛠️ Print Settings

• Material: PETG is highly recommended. It handles fluid residues (oil/fuel) much better than PLA and offers the slight flexibility needed for smooth threading.
• Layer Height: 0.15mm is ideal for clean, functional threads. 0.20mm also works if your printer is well-calibrated.
• Infill: 15-20% is sufficient.
• Walls: 3 wall lines for durability.
• Supports: None. These are designed to print without any support material.

⚠️ Important Disclaimer

These are STORAGE AND PROTECTION CAPS ONLY. They are NOT designed to hold pressure. Do NOT start your engine or pressurize any fluid system while these plastic caps are installed.