Apollo Valves/Conbraco Ind.

CSA International- Canada

CSA International- Cleveland

IAPMO R&T Lab

In-Sink-Erator

NSF International

QAI LABORATORIES

Sloan Flushmate

Stevens Institute of Technology

USC School of Eng. FCCCHR

US Analytical Laboratories

Wilkins/Division of Zurn Ind.

WRC- NSF Ltd.

Pageland, SC

Toronto, Canada

Cleveland, OH

Ontario, CA

Racine, WI

Ann Arbor, MI

Tulsa, OK

New Hudson, MI

Hoboken, NJ

Los Angeles, CA

Fullerton, CA

Paso Robles, CA

Oakdale, Gwent, Wales, UK