The 872 is an extension tool for upgrading all 850 Professional IC instruments. It enables an additional dual channel peristaltic pump, six port injection valve as well as a ten port selector valve to be installed into the 850 Professional IC. The 872 Extension Module Liquid Handling extends the capabilities of Metrohm Inline Sample Preparation «MISP» a technique that Metrohm has pioneered as long ago as 1997.