Browse Our Selection › Squibb Separating Funnel, 250ml - 19/26 Plastic Stopper, PTFE Key Stopcock, Graduated - Borosilicate Glass - Eisco Labs Image 1 of 1 Squibb Separating Funnel, 250ml - 19/26 Plastic Stopper, PTFE Key Stopcock, Graduated - Borosilicate Glass - Eisco Labs $36.22 Borosilicate glass with interchangeable plastic stopper and PTFE � Key stopcock. Graduated. Cap. 250 ml, Socket Size 19/26 Quantity: Add To Cart Added! Borosilicate glass with interchangeable plastic stopper and PTFE � Key stopcock. Graduated. Cap. 250 ml, Socket Size 19/26