DWK Life Sciences (Kimble) Closure,Open-Top PP Screw Thread,W/Bonded White PTFE Liner,13-425 GPI Thread Finish,Color:Black - 1000 ea. Specifications. 2807803: 73814BK-13425: $381.95: CS: 975-10553: DWK Life Sciences (Kimble) Closure,Open-Top PP Screw Thread,W/Red PTFE-Faced Silicone Septa,13-425 GPI Thread Finish,Septa: Standard,Color:Black