You can order predyne valves directly from Peter Paul electronics.  Give
them the OEM part number from the valve and they will sell it to you
directly at considerably less cost. 

Their web page is found at:  http://www.peterpaul.com/

Len


-----Original Message-----
From: Francois Gauthier-Lafaye [mailto:[log in to unmask]]
Sent: Monday, January 11, 1999 9:47 AM
To: [log in to unmask]
Subject: items for VG-OPTIMA


I am working with an VG-OPTIMA which has some trouble with the pneumatic
valves. It appears that it is the piston of the valve (ref: predyne valve)
which has a leak. Micromass does not sell the piston but all the valve at a
very expensive price.
Does any one know the manufacturer of these valves (or more generally of
the VG-Micromass items). We should be able to replace the common items at
better price.
Thank you very much.
Francois Gauthier-Lafaye

***************************************************
Francois GAUTHIER-LAFAYE
Ecole et Observatoire des Sciences de la Terre
UMR 7517 - CNRS-ULP
Centre de Géochimie de la Surface
1 rue Blessig
67084 Strasbourg - France

Ph : 33 (0)3 88 35 85 62
Fax :  33 (0)3 88 36 72 35