Figure 3. Nitrogen cover plate to push liquid through reaction vessel into waste bottle.

The U-Block reactor is attached to empty head to collect the liquid from all 48 tubes into one tube going to the waste (glass bottle in the picture). The head can be exchanged in case it is necessary to keep the content of each tube separate (see Figure 6). Wash solutions are added using a repeater. Liquid from all 48 tubes is pushed into waste bottle. This set up can be replaced by an alternate configuration; however, it makes the multiple wash steps both more convenient and more reproducible between runs.