Teflon® Stopcocks
Teflon stopcocks hold better vacuum than other stopcocks and also avoid the use of excess grease which may be incompatible with some chemistry.
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Products
1 
With 1:5 PTFE plug and a threaded pressure nut. Stopcock barrels are polished to prevent PTFE plug from scratch.
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2 
Stopcock with three stems sealed 90° apart. PTFE plug has a "T" shape bore to connect any two or all three stems.
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4 
A 1:5 taper Teflon® stopcock with three sidearms sealed 120° apart. Plug has a bore to allow connection of any two arms at once.
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