Each plunger must be used with a cylinder of the same size (diameter). If you have two different plungers of the same size, they can use the same cylinder. 

If you order a Type B or Type F depositor, both the plunger and the cylinder must be ordered separately. There is no standard plunger or standard cylinder supplied with your depositor.

It saves time and expense to have all plungers the same size. The most common plunger and cylinder size is 1¾" (45 mm). But donuts are becoming supersized, along with other foods!