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Hi 
I am using the stainless steel diaphragm valve on my Delta-S when I opened
the valve this morning the vacuum higher than normal 7.1E-6 instead of
2.3E-6. Is there an internal part that can be replaced or do I need a new
valve, this one is 5 years old.
Thanks 
Pat
 
Patrick D. Anderson
Analytical Chemist
Great Lakes WATER Institute
University of Wisconsin- Milwaukee
600 E. Greenfield Ave.
Milwaukee, WI 53204
phone:414-382-1731
fax:414-382-1705
            "Golf is a game whose aim is to hit a very small ball into a
even smaller hole, with weapons singularly ill-designed for the purpose."
            Winston Churchill