Several companies sell them. Fisher offers a heavey duty polyethylene funnel in sizes up to 343 mm (about 14 inches). This should be fine for paraffin, though I wouldn't use it for xylene or other hydrocarbon solvents since it is polyethylene. Fisher also offers a polypropylene funnel in sizes up to 270 mm (about 11 inches), which would be good for wax or solvents.
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