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