To convert milliliters to liters, you divide by 1,000, because there are 1,000 milliliters in a liter.
Given that the cylinder holds 6,750 milliliters:
\[ \text{Liters} = \frac{\text{Milliliters}}{1,000} = \frac{6,750}{1,000} = 6.75 \]
So, the cylinder holds 6.75 liters.