See the image below review the O-ring placement. The function of the O-ring it to assure a patent seal.
Z330965
Lenz® Squibb separating funnel
funnel capacity 2,000 mL, joint: ST/NS 29/32, PTFE key, graduated: no
About This Item
Recommended Products
material
PTFE key
borosilicate glass 3.3
Joint
joint: ST/NS29/32
feature
graduated: no
manufacturer/tradename
Bistabil®
Lenz 4.0141.73
funnel capacity
2,000 mL
plug bore
6.0 mm
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bought funnels recently and are wondering where to put the black O ring and its main function? seems to be two places for it to fit.
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