This video is an explanation of the different seal chambers (stuffing boxes) that we use. It highlights the advantages of oversized seal chambers, "large bore" and "taper bore".
Oversized seal chambers increase radial clearance between the mechanical seal and seal chamber, as well as provide better circulation of liquid to and from the seal faces, preventing failure of the shaft seal.
For more info see page 9 of this manual:
http://www.griswoldpump.com/811LF.pdf
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