USON Legacy Products

We have customers in certain markets where we developed specific products unique to their needs and we continue to support them with selected limited access products. While these products do not have an infinite life, we are stretching them well beyond their designed life cycle to help our customers stretch their development costs. If you have a need to service one of these legacy products, please contact us for more information.


Uson | Qualitek 626

Qualitek 626

The Qualitek 626 is a cost effective differential pressure decay leak tester. Replacement for the 626 is the 628 leak tester

Operator Manual

USON | Qualipak 710 & 720

Qualipak 710 & 720

Qualipak 710 & 720 are no longer available.  Contact us for the replacement part,  Qualipak 750, 770 or 780 depending on the application.

USON | Sprint LC

Sprint LC

Sprint LC has been replaced with Sprint mD.  Learn more about the Sprint mD Leak Tester.


Testra PD

Contact us for more information.  Replacement for the Testra PD is either  Sprint iQ or Sprint mD depending on the application



We do not sell trace gas detectors anymore.  There is no replacement. Please contact us for more information.

USON | Raptor


The Raptor leak tester was discontinued on January 1, 2022.

Operator Manual