Closures for Snap Ring vials. clear polyethylene cap, PTFE/red rubber, thread for 11 mm snap ring, pkg of 100 ea. polypropylene seal, PTFE/silicone (with starburst), thread for 11 mm (snap ring), pkg of 100 ea. clear polyethylene cap, red PTFE/silicone, thread for 11 mm (snap ring), pkg of 100 ea.