"Sleeve" style septum with hollow plug for use with 14/20 outer joint. Top is flanged with an extension that folds down over the neck of a vessel for a tight seal. The diaphragm can be punctured readily with a syringe needle. Puncture seals automatically after the needle is withdrawn. NC-14467
$1.95Fits 15X125 Test Tubes. Silicone stoppers are particularly useful due to their inert and nonreactive nature. Heat to 450°. Chemical resistant. NC-14555. Sold in a pack of 12 stoppers.
$5.05"Sleeve" style septum with hollow plug for use with 19/20 outer joint. Top is flanged with an extension that folds down over the neck of a vessel for a tight seal. The diaphragm can be punctured readily with a syringe needle. Puncture seals automatically after the needle is withdrawn. NC-14468
$2.25Silicone stoppers are particularly useful due to their inert and nonreactive nature. Heat to 450°. Chemical resistant. NC-14556
$0.80Fits 12X75 Test Tubes. All of our black rubber stoppers are laboratory grade. Available as solid only. NC-0969
$0.40"Sleeve" style septum with hollow plug for use with 24/40 outer joint. Top is flanged with an extension that folds down over the neck of a vessel for a tight seal. The diaphragm can be punctured readily with a syringe needle. Puncture seals automatically after the needle is withdrawn. NC-14469
$2.95Fits 20X150 Test Tubes. Silicone stoppers are particularly useful due to their inert and nonreactive nature. Heat to 450°. Chemical resistant. NC-14557
Fits 15X125 Test Tubes. All of our black rubber stoppers are laboratory grade. Available as solid or 1-hole. NC-0968
$0.50Silicone stoppers are particularly useful due to their inert and nonreactive nature. Heat to 450°. Chemical resistant. NC-14920
Fits 18X150 Test Tubes. All of our black rubber stoppers are laboratory grade. Available as solid or 1-hole. NC-0950
$0.50Fits 25X150 and 25X200 Test Tubes and 24/40 ground glass openings. Silicone stoppers are particularly useful due to their inert and nonreactive nature. Heat to 450°. Chemical resistant. NC-14558
All of our black rubber stoppers are laboratory grade. Available as solid or 1-hole. NC-0951
$0.55
