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Polypropylene screw caps with integrated septa. These precision-fit septa provide an evaporation proof seal.  
 
Reference Description SU Price
Blue, PTFE/red silicone rubber septa* 100
Green, PTFE/red silicone rubber septa* 100
Red, PTFE/red silicone rubber septa* 100
Black, PTFE/red silicone rubber septa* 100
Blue, PTFE/silicone septa 100
Green, PTFE/silicone septa 100
Red, PTFE/silicone septa 100
Blue, PTFE/silicone/PTFE septa 100
Blue, Pre-slit PTFE/silicone septa 100
Green, Pre-slit PTFE/silicone septa 100
Red, Pre-slit PTFE/silicone septa 100
Green, PTFE/silicone/PTFE septa 100
Red, PTFE/silicone/PTFE septa 100
Blue polypropylene cap, Bonded PTFE/silicone septa 100
Blue polypropylene cap, Bonded pre-slit PTFE/silicone septa 100
Blue, PTFE/red silicone septa 500
Green, PTFE/red rubber septa 500
Blue, PTFE/silicone/PTFE septa 500
Green, PTFE/silicone/PTFE septa 500
Blue, PTFE/silicone septa 500
Green, PTFE/silicone septa 500
Blue, Pre-slit PTFE/silicone septa 500
* * Commonly referred to as "red rubber"  
 
 
 
 
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