• AMS A4520 organic vapor respirator cartridge with bayonet connection and high-density activated carbon filter side view
  • Industrial worker using grinder with sparks flying wearing AMS safety respirator mask and filters in a US workshop
  • Pair of AMS A4521 KN95 pre-filter cotton pads with directional usage instructions for respirator cartridges

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AMS A401 Filter Retainer (Cover) | Holds A4521 Cotton Filters | Secure Snap-on Fit

AMS A401 Filter Retainer (Cover) | Holds A4521 Cotton Filters | Secure Snap-on Fit

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

AMS A401 Filter Retainer (Cover) | Holds A4521 Cotton Filters | Secure Snap-on Fit

$15.00
$15.00
SAVE Sold out

SECURE YOUR PROTECTION: DURABLE FILTER RETAINERS

The AMS A401 is the essential connector designed to hold AMS A4521 Particulate Filters securely onto your gas cartridges. Made from high-strength translucent polypropylene, it withstands industrial wear and tear while allowing you to inspect filter status at a glance.

Key Features:

🔒 Snap-On Security: Features a precise locking mechanism that clicks firmly onto AMS A4520 cartridges, ensuring the pre-filter never slips during work.

💎 Translucent Design: Clear material allows for easy visual inspection of the cotton filter's saturation level without disassembly.

🛡️ Impact Resistant: Rugged construction protects the delicate cotton filter from sparks, moisture splashes, and physical abrasion.

🔄 Perfect Compatibility: Specifically molded to fit the AMS A4520 series gas cartridges and equivalent models.

⚠️ Usage Note:

This product is a reusable plastic holder. Does not include the white cotton filter (A4521) or the chemical cartridge (A4520). These must be purchased separately or as a bundle.

Best For: Spray Painting, Sanding, Chemical Handling, and any environment requiring pre-filtration to extend cartridge life.

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How long does shipping take?

For U.S residents, shipping takes 4-5
business days. For international orders, it takes 7-14 business 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.

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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.

    Compatible Respirators

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

      AMS A420P Professional

      The Soft Silicone Standard:
      Features a durable soft silicone facepiece that offers superior comfort and a tighter seal than basic rubber, reducing pressure during long shifts.

      Best For:
      Auto Body Painting, Chemical Processing, and Construction.

      AMS A420P 
    • AMS A620 Professional Half-Face Respirator Mask with Dual Filter Cartridges for Painting and Chemical Protection

      AMS A620 Classic

      The Daily Driver: Constructed from lightweight TPE rubber for all-day comfort without fatigue.

      Secure Fit: Features a standard double-strap harness for a stable, leak-proof seal.

      Best For: DIY projects, Spray painting, and General construction.

      AMS A620 
    • Front view of AMS A820 half face respirator made of grey liquid silicone with bayonet filter connections.

      AMS A820 Premium Silicone

      Liquid Silicone Comfort: Made from hypoallergenic Liquid Silicone Rubber (LSR). Soft on the skin, prevents rashes, and withstands high heat.

      Pro Grade: Durable valve design reduces heat and moisture build-up inside the mask.

      Best For: Professional Welders, Chemical handling, and Sensitive Skin.

      AMS A820 
    • AMS A680 Professional Full Face Respirator Mask front view with dual chemical filter cartridges.

      AMS A680 Full Face

      Total Protection: Integrates high-impact eye protection with respiratory safety in one unit.

      Panoramic View: Large polycarbonate lens ensures a wide, distortion-free field of vision.

      Best For: Heavy industrial fumes, Chemical splashing risks, and High-dust environments.

      AMS A680 
      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

      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.