About Us — STELSEP

Who We Are

The Specialist Manufacturer

STELSEP is the specialist manufacturer of uncomplicated & reliable oil/water separators and aftermarket service kits. We represent the home of condensate management.

As a privately owned business, our team possesses decades' worth of real-world knowledge and extensive experience in the industry — experience we willingly share with our partners.

We're proud of our quality, service, support, stock availability and cost-effectiveness. Same-day shipping from stock on most items.

30+

Years combined industry experience

3

Product ranges — OWS, kits, drains

The Environmental Imperative

A single 25 hp compressor running 8,000+ hours per year generates approximately 265 gallons of condensate — containing over 2.5 gallons of oil.

That quantity of oil is sufficient to impact 20–25 acres of surface water. Discharging condensate to a storm drain, stream or groundwater is NOT permitted.

Environmental impact of untreated condensate

Our Expertise

About What We Do

In-House Design

Our oil/water separators are designed entirely in-house, with no gravity pre-separation stage and no separate oil container to empty. The result is a simpler, more reliable product.

No Moving Parts

Our separators feature a simple, cost-effective, leak-free design with no moving parts or adjustments. Special filter media handles the separation reliably, every time.

Proprietary Media

Our polypropylene wool/shred filter media outlasts activated carbon alternatives, is lighter to handle, drains faster, and produces superior outlet quality with a lower blockage risk.

The Team

Leadership & Experience

Industry veterans with decades of combined, real-world knowledge across manufacturing, distribution and business development.

Mike Amphlett

Director

Mike has held senior industry positions since 1994 in the UK and abroad. He focuses on business development and the internal structures that allow STELSEP to deliver consistently excellent service to its customers.

John Gillen

Director

John brings multi-year experience from both the manufacturer and distributor sides of the industry. He leads product development, ensuring STELSEP's range continues to evolve to meet customer needs.

Partnering With Us

What You Can Do

STELSEP works with distributors, installers and end-users across the industry. Whether you're specifying a system, maintaining existing equipment, or looking for a better service kit, we can help.

Select the right separator — use our experience to match the correct unit to your compressor output, hours of operation and condensate type.
Service third-party equipment — our OWS service kits fit a wide range of brands, often at lower cost and with better performance than OEM alternatives.
Test your discharge — send us a condensate sample and we'll analyse the hydrocarbon content, with a written report within 5 working days.
Reduce your air costs — replace wasteful timed drains with intelligent zero-loss units and save hundreds of pounds in compressed air annually per drain point.

Oil/water separator cutaway showing internal filter media

About STELSEP