This is a tapered rubber plug used to help seal around the light cord. This is a split plug used for a retrofit light. 1 hole for the cord. Eliminate water leaks at pool light forever. Slide in cord and push into conduit. Never mess with putty or silicon again. Part number: Q-CS2. Outside Diameter: 1-1/8" (Large End) Outside Diameter: 13/16" (Small End) Length: 1-3/16" Cord Hole Diameter: 3/8"