US Patent 7945139 Dust cap for fiber optic adapter

An adapter dust cap comprising a dust cap body defining a clearance extending at least partially therethrough, a resilient member attached to the connector body, and a latching feature attached to the resilient member and configured to engage within internal geometry defined by a connector adapter. The adapter dust cap is translucent so that visible light from a connector may diffuse therethrough, and may include a material or coating thereon for converting light in the invisible spectrum to visible light so that the light can be detected through the dust cap without removing the dust cap from an adapter to which it is engaged.