Labconco XPert Weigh Boxes 5220331 - Manual (Page 45)

Chapter 7: Accessorizing Your Glove Box
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38. Inlet-Outlet Connection Kit – No HEPA (Part #5253400)
The 3.94" OD inlet-outlet connection kit consists of two sealed flange
connections that attach to the inlet and outlet vent holes of the glove
box main chamber when the HEPA filter housings and HEPA filter
are removed. The connection kit enables direct connection of 4.0" ID
hose or ductwork to the glove box.