About Us

Duff & Associates LLC — Joplin, MO

Who We Are

Duff & Associates LLC is an industrial equipment sales and services company based in Joplin, Missouri. We specialize in dampers, expansion joints, and related industrial components, serving facility managers, engineers, and procurement professionals throughout the Midwest.

Founded by Phillip Duff, the company has built its reputation on deep product knowledge, responsive service, and a genuine commitment to helping clients find the right solution for their specific application — whether that's a standard off-the-shelf component or a custom-fabricated assembly.

We work with leading manufacturers to bring quality products to our clients, and we back every sale with the technical expertise and field service capabilities to ensure long-term performance.

Why Choose Duff & Associates

Trusted Expertise

Years of experience in industrial equipment sales and services across the Midwest.

Quality Products

We represent leading manufacturers to deliver reliable, high-performance industrial components.

Customer Focus

We take the time to understand your needs and recommend the right solution for your application.

Responsive Service

Fast turnaround on quotes, orders, and field service requests to minimize your downtime.

Technical Knowledge

Our team brings deep technical knowledge of dampers, expansion joints, and related systems.

Midwest Roots

Based in Joplin, MO — we're proud to serve industrial clients throughout the Midwest region.