Bio-Rad Econo Gradient Pump Kits - Manual (Page 15)

When using tubing other than precut tubing from Bio-Rad, the tubing
must be cut to the following lengths to accommodate prestretch:
Tubing Length
Tygon, PharMed 179 mm +/- 1.5 (7.04” +/- 0.05)
Silicone 171 mm +/- 1.5 (6.75” +/- 0.05)
Install tubing onto the pump head as described in Section 4.2.
Warning: If using tubing other than the type supplied by Bio-
Rad, make sure the wall thickness is not greater than 1.0
mm. Using tubing with a greater wall thickness can damage
the pump and void your warranty.
Figure 4-2. Tubing installation.
Tubing Selection
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