Miata Drain Defender Kit (1990–2005 NA/NB)

Stop Rust, Mold, and Water Damage — Protect Your Miata with This Complete Drain Solution

Your Mazda Miata (1990–2005 NA/NB) could be silently rusting from the inside out — especially around the bottoms of the fenders. The Miata Drain Defender Kit is a complete solution designed to prevent clogged drain passages, wet carpets, moldy interiors, and rusted-out fenders — all without needing any tools to install

This all-in-one kit installs in minutes and gives you peace of mind whether your Miata is garaged or parked outside.

Why You Need This Kit

Miatas are known for fun — not for rust and leaks. But common design flaws in the NA and NB Miata drainage system lead to serious issues:

• Clogged fender drains that trap debris and moisture, leading to hidden rust
• Rain rail clogs that cause water to overflow into the cabin and soak your carpets
• A-pillar drain collapse that soaks your seat and floor, encouraging mold growth

The Miata Drain Defender Kit addresses all of these common problems with innovative, 3D printed inserts that keep water flowing where it should — out of your car.

What’s Included:

• 2x Front Fender Drain Screens Prevent leaf and dirt buildup inside the fender cavity. These screens install in seconds using a built-in compliant mechanism — This allows the part to flex and snap into place. No tools or clips needed.
• 2x Rain Rail Drain Screens These screens drop directly into the factory soft top drain holes. They include tapered locking ribs to keep them firmly in place and keep debris out of your Miata’s rain rail drains — one of the most common clog points that can lead to a wet interior.
• 6x A-Pillar Drain Channel Support Spacers Choose from 3 sizes (all included) to reinforce the soft top drain channel and keep water flowing freely. These fix the common problem of the door pinching the A-pillar seal closed. This causes wet seats, carpet mold, and other interior damage. These simply slide into the seal and prevent the door from fully collapsing the drain passage.

Key Benefits:

• Prevents rusted Miata fenders
• Stops rain rail drain clogs
• Eliminates interior water leaks
• Fixes A-pillar drain collapse
• Quick, tool-free installation
• Durable, weather-resistant PETG construction
• Fits all 1990–2005 Mazda Miata (NA and NB) models

Installation

All parts are snap-fit and install in minutes — no screws, clips, adhesives, or tools required. Simply flex and fit the parts in place using the precision-designed geometry.

Park with Confidence

Whether your Miata lives in the garage or under the sky, the Drain Defender Kit helps ensure your car stays clean and dry inside and out. Don’t wait for rust or mold to show up — protect your Miata’s longevity with this simple upgrade.

What’s in the Box?

• 2x Front Fender Drain Screens
• 2x Rear Rain Rail Drain Screens
• 6x A-Pillar Drain Channel Spacers (Small, Medium, Large)
• Installation guide PDF (optional printable version)

Fits all NA and NB Mazda Miata models (1990–2005)

Material: PETG (UV- and heat-resistant)