Gray 1000 Piece West Brand Rubber 20mm Serum Stopper Lot Snap On S-63 1F

Description

These are our most popular stoppers.
WE HAVE THE BEST PRICE ONLINE FOR A LOT THIS SIZE!
Here we have a 1000 piece lot (
in
one zip locked bag as pictured
) of new
West Brand Rubber 20mm Straight Plug Stopper, Gray.
Formula:   S-63 890 GRY
This design provides maximum sealing for vials with a blow-back glass finish, which is a small ridge on the interior of the vial’s neck. The snap-on stopper locks into the blow-back ridge, providing a tight seal and keeping the stopper from backing out. This style is not recommended for vials with a straight-walled finish. The blow-back feature is typically found in vials from North American manufacturers.
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