| a few definitions
plumbing pipe comes in a number of sizes, expressed in inches in the u.s.a. when one refers to a 2" pipe, it means a pipe of 2" i.d. (internal diameter). the o.d. (outside diameter) would be about a half inch larger on schedule 40 pvc.
a 2" bulkhead fitting would would be used for a 2" pipe. therefore, the diameter of the hole necessary for the bulkhead fitting would be larger than 2". when selecting a holesaw or method of putting a hole in the side of your pond, be sure to check what size is required for the brand of bulkhead fitting you bought. you do not want more than 1/16" play around the fitting.
so when selecting a location to install your bulkhead fitting, be sure that the area is large enough to take the full diameter of the fitting. for a 2" pipe, the diameter of the bulkhead fitting will be far more than 2".
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