What are the exact dimensions of the 20ml and the 30ml vial: diameter and height?

I do no know, I purchased the 10ml vials. It says 50 x 22 mm on the box.

Does the rubber seal on the inside of the vial have a small gap in the rubber to allow all of the med to be drawn up, or is it continuous on inside?

I've never seen what you mention. The rubber is a one piece seal with no holes. When you insert a syringe into it, it makes a hole, however, it seals up (this is the self healing feature they're talking about). So you tear the plastic cap off permanently, which exposes the rubber seal. It seals up so tight, that the contents can not escape even when upside down.

ASIN	B091MJLN5X
Age Range Description	Adult
Best Sellers Rank	2,828 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 7 in Lab Vials
Bottle Type	Glass Bottle
Bottle type	Glass Bottle
Brand	Ks-Tek
Capacity	10 Millilitres
Colour	Transparent
Container Type	Bag
Customer Reviews	4.7 out of 5 stars 408 Reviews
Item Dimensions W x H	22W x 50H millimetres
Item Weight	0.15 Kilograms
Manufacturer	Ks-Tek
Material	Glass
Material Type Free	Bisphenol A (BPA) Free
Number of Items	10
Product Care Instructions	Hand Wash Only, Store in a cool, dry place, Avoid high temperatures
Recommended Uses For Product	Laboratory use, Medical use
Reusability	Disposable
Shape	Cylindrical
Special Features	Self-healing injection port
Special feature	Self-healing injection port
Style	Laboratory
Theme	science
UPC	761412815841
Unit Count	10.0 count

Ks-Tek Sterile Empty Vials with Self Healing Injection Port,with Flip Off Aluminum Cap,Sterile Package (10ml,10)

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