The 3M™ E-A-R™ UltraFit™ Earplugs – 340-4004 deliver reusable, comfortable, and reliable hearing protection for a wide range of industrial applications. Designed with a premolded triple-flange structure, these earplugs offer a push-to-fit solution that eliminates the need for rolling, reducing the risk of contamination. With a Noise Reduction Rating (NRR) of 25 dB and CSA Class AL certification, the UltraFit™ earplugs provide consistent protection in moderate to high-noise environments. A durable vinyl cord keeps the earplugs conveniently accessible between uses, making them an economical and environmentally conscious solution for workers needing all-day hearing protection.

Key Features

Triple-Flange Design : Conforms comfortably to most ear canals for a secure seal without the need to roll down.

Reusable and Hygienic : Washable and long-lasting, reducing waste and replacement frequency.

Corded for Convenience : Vinyl cord prevents loss and keeps plugs within reach when not in use.

High Performance : NRR of 25 dB, suitable for industrial settings up to approximately 100 dBA.

CSA Class AL Certified: Approved for use in Canadian workplaces with high noise exposure.

Moisture Resistant : Maintains performance in humid or high-moisture environments.

One Size Fits Most : Designed to comfortably fit the majority of ear canal sizes.

Intended Use

Ideal for industrial workers, including those in automotive, construction, metal fabrication, oil & gas, marine, mining, transportation, and general manufacturing. Perfect for tasks such as machine operation, sanding, grinding, welding, demolition, painting, electrical work, and facility maintenance, especially where hygiene and durability are priorities.

Product Specifications

Product Number: 340-4004
3M ID / SAP ID: 7000002320
Legacy SKU: 70071515772
Color: Yellow plugs with Blue Vinyl Cord
Corded: Yes
Cord Material: Vinyl
Reusable: Yes
Shape: Multi-flange
Insertion Style: Push-to-fit (No roll-down required)
Material: ABS/Elastomeric Polymer
Dielectric: No
Moisture Resistant: Yes
Slow Recovery Foam: No
Metal Detectable: No
Packaging: Polybagged pairs
Fit Verification: Compatible with 3M™ E-A-Rfit™ system

Certifications and Standards

CSA Class AL – Compliant with Canadian hearing protection standards
ANSI S3.19-1974 – Meets U.S. EPA requirements for hearing protector testing
NRR 25 dB – Certified noise reduction performance