T-H Marine Push-In Drain Plug For 1-1/8" & 1-1/4" Thru-Hulls Black #232-PP118 Bulk. Outside Dimensions 1-1/8" & 1-1/4". These push in plugs are used to stop water flow through drains or overflows from baitwell or livewell. Also work well as plugs for sink drains and built in cooler drains. Plugs are a perfect compliment to T-H Marine overflow drain tubes. These plugs are injection molded of marine grade PVC for a long lifespan. Plugs feature a pull tab or pull ring for easy removal. They have double seal rings to assure positive sealing.