Flat Bottom Boiling Flask, Heavy Wall Four Neck, Center Neck & Three Angled Side Neck .Thermometer Pocket Fitted with One Side Neck Joint 

Flask capacity 100ml.  Center neck joint size B-24(24/29). All side necks joint size B-19(19/26)

Flask capacity 250ml.  Center neck joint size B-24(24/29). All side necks joint size B-19(19/26)

Flask capacity 500ml.  Center neck joint size B-24(24/29). All side necks joint size B-19(19/26)

Flask capacity 1000ml.  Center neck joint size B-24(24/29). All side necks joint size B-19(19/26)

Flask capacity 2000ml.  Center neck joint size B-34(34/35). All side necks joint size B-24(24/29)

Flask capacity 3000ml.  Center neck joint size B-34(34/35). All side necks joint size B-24(24/29)

Flask capacity 5000ml.  Center neck joint size B-40(40/45). All side necks joint size B-24(24/29)

Flask capacity 10000ml.  Center neck joint size B-50(50/55). All side necks joint size B-24(24/29)

Flask capacity 20000ml.  Center neck joint size B-50(50/55). All side necks joint size B-24(24/29)