3100 Polymer Block
Residue on the lower polymer block or bubbles in the polymer line or opaque tubing can causearcing, which then corrodes the interior of the acrylic block, thus preventing the pin valve from closing completely and hence necessitating the replacement of the $1180 lower polymer block assembly, as witnessed on August 19, 2002.

Bent Capillaries and Stacked Septae
as witnessed on May 4, 2004.

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