Walls Oiltight hole seals Oiltight hole seals Oil-resistant gasket for pushbutton switch cutout Carbon steel Used to seal unused or empty pushbutton holes, conduit openings, knockout openings. Read more Oiltight hole seals Oil-resistant gasket for mini-pushbutton switch cutout Carbon steel Used to seal unused or empty pushbutton holes, conduit openings, knockout openings. Read more Oiltight hole seals Oil-resistant gasket for mini-pushbutton switch cutout Stainless steel Used to seal unused or empty pushbutton holes, conduit openings, knockout openings. Read more Oiltight hole seals Oiltight hole seals for conduit hole Stainless steel Read more Oiltight hole seals Oiltight hole seals for conduit hole Carbon steel Used to seal unused or empty pushbutton holes, conduit openings, knockout openings. Read more