The Pioneer of Modern Leak Testing

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.

Here are some examples of “Uson Legacy Products”:


Qualitek 626

The Qualitek 626 is a cost effective differential pressure decay leak tester. The Qualitek 626 offers menu driven operation allowing for easy set up and results interpretation, reducing operator errors. Learn more about the Qualitek 626.


Qualipak 710 & 720

Qualipak 710 & 720 are no longer available.  Contact us for the replacement part.


Testra PD

Contact us for more information.


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Product Literature

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Contact Us


Uson L.P. - Corporate

8640 N. Eldridge Parkway
Houston, TX 77041 USA

Tel: +1-281-671-2000
Fax: +1-281-671-2001


Uson UK – Europe

Western Way
Bury St. Edmunds
Suffolk, IP33 3SP United Kingdom

Tel: +44-1284-760606
Fax: +44-1284-763049


Uson – China

Room 601, 567 Lan Gao Road
Shanghai, 200333, China

Main: 021-583 65859, 021-583 59187
Fax: 021-583 59185, 021-337 73559