AdvanTec Marine is the parent brand to Diamond Sea Glaze, Freeman Marine, Pacific Coast Marine, and Steelhead Marine who specialize in: design, engineering and manufacturing of specialty application closures. We are one of the largest marine manufacturers in the world, have geographic locations in the US & Canada, and ship to over 50 countries worldwide. Our customer base include North American & International Navies, Governments, Militaries, Commercial Vessel and Super Yacht Builders. We are a growing team of close to 300 people, and all of our products/solutions are conceived, designed, engineered and manufactured here in North America.

Why choose AdvanTec Marine?

For over 40 years our brands have been collectively the leader in innovation and creative manufacturing systems and processes. We are committed to delivering solutions to meet customer requirements using our process of customer consultation, creative and collaborative thinking, innovative design solutions, and world class manufacturing systems. No matter what Vessel Type, Size or Industry your working on, we have the product you need. Our goal is to Build, Supply & Support the Finest Equipment in the industry. We offer after Sales Service, Installation & support for all products sold.


Military Patrol Vessels

Super Yachts

Aluminum Commercial Workboats

Military Vessels

Commerical Workboat Vessels

Recreation Boats


Over 120 year of collective experience in the design, engineering and manufacturing of closures in North America.
A company that will stand behind its technology and is going to be around for the life of its product.
Over 25 engineers and a host of technical staff spread in key geographies for faster response time on technical matters.
Introduced a myriad of solutions that have become industry benchmarks including aluminum cast hatches, ultra-lightweight cranes and DiamondFrit™ glass.
One Stop Solution
One of the largest closure manufacturers in the world delivering class approved projects, standard & custom closures, cranes, portlights, hatches & accessories for all kinds of marine application.
Global Presence
Solutions exported to over 50 countries to a diverse range of clients from international navies and defense equipment.
State Of The Art Facilities
in both USA and Canada
Long Lasting Quality
Industry standard manufacturing brand name and quality to last longer and save you time and money
Service and Maintenance
Anywhere in the world, anytime
On time delivery, GUARANTEED
quick and efficient through the entire process from design to manufacturing