About Sealing Devices

Since 1963, Sealing Devices has been a proud manufacturer, fabricator, and distributor of O-Rings, gaskets, EMI shielding and thermal interface materials, custom molded rubber parts, protective vents, tapes, adhesives, and sealants for all types of sealing applications. With over 200 pieces of state-of-the-art manufacturing equipment, our goal is to be your trusted partner for all of your seals and gasketing needs.

Our wide range of capabilities consist of fabrication, die-cutting, waterjet and laser cutting, slitting, laminating, form-in-place gasket dispensing, injection, compression and transfer molding, and specialized packaging and barcoding. We’re an authorized distributor for Parker, Gore, 3M, Rogers, Loctite, and many other world leading sealing materials manufacturers, supplying to the Transportation, Aerospace, Military, Electronics, Communications, General Industrial, Fluid Power industries.  Sealing Devices Quality Management Systems are certified to AS9100D and ISO 9001:2015 standards and we are ITAR registered.


At Sealing Devices, we always consider ourselves to be “First Class” in everything we do. Since our start in 1963 we’ve been proudly family-owned and operated. With second generation leader Terry Galanis, Jr. and soon to be third generation Elizabeth Galanis-Miller, we move forward as a premier manufacturer and distributor in the seals and gaskets industry by honoring the solid ethics and values of our founder, Terry Galanis, Sr.

For nearly 60 years we’ve been committed to our customers, employees and community by striving to provide outstanding quality, service, and value. Headquartered in Lancaster, NY with a team of 190 associates in six offices throughout the U.S., Sealing Devices is an industry leader with a focus on working hard, being courteous, kind and always doing the right thing.


Our History

Terry Galanis Sr. started Sealing Devices in 1963 in his home in Alden, NY with an investment of $157 in Parker O-rings, a telephone, a pencil and his wife Marian.


Our Leadership

Meet our experienced leadership team led by second-generation owner, Terry Galanis, Jr.



Sealing Devices was built on strong ethics and values of integrity, honesty and character.



Check out Sealing Devices' news for our latest company achievements, and capability announcements.



Sealing Devices Quality Management Systems are ISO 9001 and AS9100D certified.