Founder & Chief Containment Officer
Walter Thorne
Four people. One gasket. Since 1973.
We make one thing. We think about it a lot.
Since 1973 · Still At It
Walter Thorne started Seel-Tite in 1973 because he had a bad week. He made one gasket. It worked. He made another. That one worked too. Fifty-two years later we still make one gasket. We have also made ten accessories that click into it, but the gasket is the thing.
We're not a tech company. We are four engineers, a small operations team, and the people who pack and ship. Most of our decisions happen in one conversation around one table. If you want something to change, email us. It will be considered.
Where The Gaskets Come From
Where Every Gasket Starts
Every G1 is molded on the same press line that has been in use since 1976. The press has been refurbished twice. The tooling has been replaced once. The dimension has not changed since 1993.
Port inserts are machined in the back bay to a tight tolerance. Every tenth unit gets measured. This is the part of the job we find satisfying.
Timeline
Fifty-Two Years of Containment
1973
Founded — Walter Thorne makes the first G0 prototype in his father's workshop.
1979
Port Standard Ratified — The OPX-14 port standard is adopted. Every accessory since clicks in.
1988
Salad Shooter Attachment — Inspired by the Presto kitchen classic. Becomes our second-best seller and stays there.
1997
First Military Certification — Seel-Tite passes a full operational compliance audit.
2011
Seal Engineering Program — Marcus Hadley joins and revises the OPX-14 to its current form.
2019
Telemetry — Dale Castellan's team ships the first Bluetooth-connected gasket accessory.
2026
G1 Rev E — Latest revision of the G1 Containment Gasket. Same principle. Better silicone.
Meet The Team
Four People. One Gasket.
Head of Seal Engineering
Marcus Hadley
VP of Disposal Systems
Jim Boecker
Director of Predictive Alerts
Dale Castellan
Compliance
Certified, Audited, Reproducible
MS
Certificate of
FDA 21 CFR 177.2600
Issued by
U.S. FDA
Since 1997
Medical-grade silicone cleared for extended skin contact.
MS
Certificate of
ISO 9001:2015
Issued by
ISO
Renewed 2024
Quality management certification renewed annually since 1997.