· Pear-shaped
· Standard Taper 24/40 bottom joints
· Squibb-type with 821001 PTFE stopcock plug
· Replacement stoppers are 850400-2425
· 636281 series is supplied without stoppers
· Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements