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BIVAR SGLC-LD Liquid Detection Sealing Gasket Lens Caps feature a color-changing leak detector that alerts the user to liquid intrusion and provides IP68 ingress protection to the interior of an enclosure. The SGLC-LD Liquid Detection Sealing Gasket Lens Caps are available in a Dome Fresnel style for a panel thickness of 0.250" (6.35mm) and a Flat Fresnel style for a panel thickness of 0.118" (3.0mm). These Lens Caps are also offered in Clear, Blue, Green, and Yellow.