• AMS A4520 organic vapor respirator cartridge with bayonet connection and high-density activated carbon filter side view

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AMS A401 Filter Retainer Cover for A4520 Organic Vapor Cartridge

AMS A401 Filter Retainer Cover for A4520 Organic Vapor Cartridge

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$15.00
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Engineered for harsh industrial environments. Powered by High-Density Coconut Shell Activated Carbon for superior absorption of organic vapors, paint fumes, and solvents. Meets GB 2890 (Type A) standards for maximum safety.

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AMS A401 Filter Retainer Cover for A4520 Organic Vapor Cartridge

AMS A401 Filter Retainer Cover for A4520 Organic Vapor Cartridge

$15.00
   
AMS A4520 organic vapor respirator cartridge with bayonet connection and high-density activated carbon filter side view

AMS A4520 Organic Vapor Cartridge for Paint and Industrial Fumes

$15.00
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AMS A401 Filter Retainer Cover for A4520 Organic Vapor Cartridge

AMS A401 Filter Retainer Cover for A4520 Organic Vapor Cartridge

$15.00
$15.00
SAVE Sold out

Protect your respirator mask with filters from fine sawdust and chemical overspray. Whether you need a reliable paint mask for automotive work or heavy-duty renovations, the AMS A401 Filter Retainer Cover locks your pre-filters securely to extend the life of your safety gear.

Core Benefits

  • AMS Eco-System Perfect Fit: A dedicated snap-fit mechanism locks exclusively onto the AMS A4520 Organic Vapor Cartridge, ensuring an airtight seal that generic covers cannot match.
  • Translucent Inspection Window: Premium clear plastic allows you to visually inspect your A4521 KN95 Pre-filters instantly, helping you replace them precisely when needed to protect the main cartridge.
  • Heavy-Duty Durability: Impact-resistant construction shields your filtration system from physical shocks and sparks, keeping your long-term replacement costs low.

Strict Compatibility Guide

This product is engineered strictly for the AMS ecosystem (AMS A420P Half Face Mask and A4520 cartridges). Please read carefully before purchasing.

  • Cross-Brand Fit: None. Designed exclusively for AMS hardware.
  • Negative Fit Warning: This is not a replacement for the 3M 501 retainer. It strictly will not fit 3M 6000 series filters (such as 6001, 6003, 6006) or any 3M-equivalent connections.

What Is Included

Please select your preferred packet size from the variant options above before adding to your cart. We offer three (3) different quantity choices to suit your workflow needs.

  • Package Contents: One (1) selected packet containing your chosen quantity of AMS A401 Filter Retainer Covers.
  • Exclusions: The respirator mask, chemical cartridges, and pre-filters are sold separately.
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How long does shipping take?

For U.S residents, shipping takes 4-13 days. For international orders, it takes 10-20 days. We provide tracking for all orders. You can also visit our Track Your Order page for the latest updates.

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What is the return policy & fit guarantee?

We stand behind our gear. If the mask doesn't fit perfectly or meet your expectations, you can return it within 30 days in unused condition for a full refund or exchange. We also offer a 1-year warranty against manufacturing defects

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Need technical help or filter advice?

Not sure which filter is right for your chemicals? Our safety specialists are ready to assist. Contact us via the chat widget or email support@amsarmor.com. We respond to all technical inquiries within 24 hours.

  • ⭐⭐⭐⭐⭐ No smell in the spray booth!
    "I use these for automotive clear coating. Paired with the AMS pre-filters, they block out the paint fumes completely. The airflow is surprisingly good—I don't feel like I'm gasping for air like with cheaper brands. Unbeatable value for the price."

    — Dave M. (Verified Buyer)

  • ⭐⭐⭐⭐⭐ Instant relief from fumes
    "I was getting headaches from working with epoxy resin and wood stains. I popped these A4520 cartridges onto my mask and the chemical smell vanished instantly. The bayonet click feels very secure. Highly recommend for any home workshop."

    — Sarah Jenkins (Verified Buyer)

  • ⭐⭐⭐⭐⭐ Solid quality, no charcoal dust
    "Finally, a filter that doesn't crumble! I've had issues with other generic filters blowing black dust after a few days, but these coconut carbon ones stay clean and solid. Comfortable enough to wear for a full 8-hour shift at the plant."

    — R. Gonzalez (Verified Buyer)
    View full details

    Painting? Stop Wasting Money on Clogged Filters

    Standard carbon filters fail quickly when paint mist coats the carbon surface—forcing you to throw them away while the carbon is still good.
    The AMS Solution: Pair the A4520 with our KN95 Pre-filter (A4521). The pre-filter blocks wet overspray, keeping your carbon cartridge clean and extending its life up to 10x.

    Why Coconut Shell Carbon

    • Close-up of AMS A4520 filter highlighted for high efficiency filtration of organic vapors, paint spray mist, and chemical fumes

      More Trapping Power

      Over 80% micropores (<2nm) act as perfect energy traps for dangerous chemical molecules.

    • Industrial worker using grinder with sparks flying wearing AMS safety respirator mask and filters in a US workshop

      Easy Breathing

      Harder carbon structure prevents dusting, ensuring clear airflow and low breathing resistance all day.

    • Internal structure of AMS respirator cartridge showing multi-layer activated carbon and pre-filter integration for maximum VOC protection

      Eco-Conscious

      Made from renewable resources, reducing the environmental footprint compared to coal-based filters.
      Cross-section view of AMS filtration system showing layer 1 KN95 pre-filter, layer 2 coconut shell activated carbon, and layer 3 final filter

      Inside the AMS Defense System

      Advanced Carbon Bed: High-density coconut shell carbon with massive surface area (>1000 m²/g) acts like a molecular sponge.

      Layered Protection:

      Inlet Grid: Disperses airflow evenly.

      Pre-filter Layer: Protects carbon from coarse dust.

      Active Bed: Impregnated carbon chemically reacts with toxins (A8530/A8560).

      Final Scrim: Prevents carbon dust inhalation.

      Side profile of AMS A420P silicone half face respirator showing brown organic vapor cartridge and adjustable head strap connection

      Compatible Respirators

      Ultimate Skin Comfort: Engineered with premium Liquid Silicone Rubber (LSR), it is ultra-soft and skin-friendly. This material is specifically designed to be non-irritating and prevents pressure marks even during extended wear.

      Extreme Durability: Exceptional heat resistance and superior elasticity maintenance in harsh environments, ensuring a significantly longer product lifespan.

      Best For: Professional welders, chemical handling, high-temperature environments, and users with sensitive skin.

      AMS A420P Professional Silicone
      Step-by-step installation guide for AMS A4520 replacement filter showing twist-lock bayonet connection and fit check

      PROTECTED IN 4 STEPS

      1. MATCH:
      Confirm your hazard is Organic Vapors (Paint, Solvents, Benzene). The A4520 is specifically engineered with coconut shell carbon to target these volatile compounds.

      2. BOOST:
      Snap on A4521 Pre-filters using the A8502 Retainer to block paint mist and dust. This simple step prevents clogging and extends your cartridge life up to 10x.

      3. CHECK:
      Cover the grid of the A4520 cartridges with your palms and inhale gently. The mask should collapse slightly against your face, confirming an airtight seal.

      4. STORE:
      Activated carbon absorbs moisture even when not in use. Always store your cartridges in a sealed Ziploc bag between shifts to maintain maximum potency.

      Why Pros Choose the AMS A4520

      Experience the superior filtration of Coconut Shell Activated Carbon. Unlike generic coal-based filters that crumble and restrict airflow, the A4520 features a high-density microporous structure. This technology traps over 99% of organic vapors—including Benzene, Toluene, and Paint Fumes—while maintaining low breathing resistance. Engineered to GB 2890 (Type A) standards, it is the trusted choice for demanding automotive and industrial environments.

        Others
      Coconut Shell Carbon
      Micropore Technology (<2nm)
      Anti-Dusting Structure
      Low Breathing Resistance
      Bayonet "Click" Seal

      Verified Customer Reviews

      Excellent 4.8 / 5

      • Game changer for clear coat!

        "I run a small auto body shop and usually get headaches by noon from the fumes. Switched to the AMS A4520 paired with their pre-filters (A4521), and the difference is night and day. I can't smell the clear coat or thinners at all. Plus, they breathe much easier than the generic brands I used to buy. Highly recommend for painters."

        Mike D. – Auto Body Technician

      • Perfect for Epoxy Resin work

        "I work with resin and the fumes are nasty. These cartridges fit my AMS mask perfectly with a solid 'click'. I tested them out yesterday during a big pour and didn't smell a thing. The silicone mask combined with these lightweight filters makes it comfortable enough to wear for hours. Great value."

        — Sarah L. – Resin Artist

      • Clean airflow, no coal dust

        "Finally, a filter that doesn't blow black charcoal dust into my face when I move around! The coconut carbon structure is definitely harder and cleaner. I use these for chemical stripping and solvent handling at the plant. They last a full week of heavy use before I need to swap them out. Solid professional gear."

        — James R. – Industrial Maintenance

        Usage & Safety

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        What gases does this protect against?

        Designed for Organic Vapors with a boiling point > 65°C, including Benzene, Toluene, Xylene, Acetone, and Gasoline fumes. Note: Not for use with ammonia or acid gases.

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        Is it compatible with my mask?

        The A4520 features a standard Bayonet connection, fully compatible with AMS A4200, A620, A680 series, and most standard bayonet-style half-face masks.

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        When should I change the cartridge?

        Replace immediately if you smell or taste contaminants, or experience irritation. For scheduled maintenance in average painting environments, we recommend replacement every 40 hours of use.