IP66 Stainless Steel Hole Plugs - Hammond HPBSS, The Hammond Stainless Steel HP Series Hole Plug is designed to seal unused pushbutton holes, conduit openings or knock-out holes against the ingress of dust, oil and water.
Secured with a 10-24 x 0.
55" threaded stud and plated wing-nut.
Hammond HPBSS IP66 Stainless Steel Hole Plug 44mm Diameter