Woodhead 5526 Cable Strain Relief Grip, Locknut, Max-Loc Cord Seal, Straight Male, 1/2" NPT Thread Size, Gray Grommet Color, .312&ndash;.375" Cable Diameter Nylon body is resistant to impact and corrosion Rubber grommet provides a liquid-tight seal and reduces cord pull-out Grommets are color-coded for easy identification Rubber grommet is best material to resist chemicals and handles a wide temperature range Available Stainless Steel mesh yields high strength, corrosion resistance and slight conductivity