AEM Water Methanol Reservoir Cap

AEM Water Methanol Reservoir Cap (Part # 30-4508) | Replacement Tank Cap

Shop the official AEM Water Methanol Reservoir Cap (30-4508). Features an integrated breather vent and non-slip ridged grip for 1.15-gal & 5-gal tanks.

The AEM Performance Electronics Water Methanol Reservoir Cap (Part # 30-4508) is a direct factory replacement cap engineered specifically for AEM water/methanol injection tanks. Whether your original cap was misplaced during maintenance, cracked from age, or lost at the track, this OEM replacement restores a secure, tight seal to keep your injection fluid contaminant-free.

Constructed from heavy-duty, methanol-resistant composite materials, the cap features a wide opening design to simplify refilling. It incorporates an integrated breather vent that allows fluid expansion and contraction during ambient temperature swings while maintaining system pressure balance. The outer edge utilizes an ergonomic ridged pattern to deliver a firm grip even with greasy or gloved hands.

Best Uses

1. Direct OEM Replacement: Ideal for replacing lost, worn, or damaged caps on existing AEM water/methanol injection systems.
2. Spare Track Equipment: Keep as a backup in your pit kit or glove box to prevent downtime at track days or drag events.
3. Custom Trunk/Engine Bay Setups: Essential finishing component when retrofitting or relocating an AEM tank setup.

Features

1. Integrated Breather Vent: Built-in venting mechanism balances internal tank pressure during fluid draw, expansion, and contraction without spilling.
2. High-Traction Ridged Outer Grip: Textured exterior ridges prevent slipping, making installation and removal simple even when wearing work gloves or handling fluids.
3. Methanol-Resistant Material: Molded from durable composite plastic engineered specifically to withstand long-term exposure to aggressive water/methanol mixtures.
4. Direct OEM Fitment: Factory-engineered threads ensure a leak-resistant seal on official AEM reservoir tanks.
5. Wide-Mouth Compatibility: Sized for rapid removal to accommodate clean, spill-free fluid refills.

Benefits

1. Prevents Vacuum Lock: The vented design ensures smooth, uninterrupted fluid draw to the injection pump by eliminating internal tank vacuum build-up.
2. Protects Injection Pump: Seals out dirt, debris, and engine bay contaminants that could clog fine mist injection nozzles or damage high-pressure pumps.
3. Universal AEM Tank Compatibility: Works seamlessly across both the standard 1.15-gallon and larger 5-gallon AEM water/methanol injection reservoirs.
4. Easy Tool-Free Operation: Grooved edges offer effortless hand-tightening without needing pliers or extra tools.
5. Cost-Effective System Maintenance: Restores proper reservoir sealing without having to replace the entire fluid tank assembly.