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	B091M77Q6X
Best Sellers Rank	3,678 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 9 in Lab Vials
Bottle Type	Aluminum Bottle
Bottle type	Aluminum Bottle
Brand	Ks-Tek
Capacity	15 Millilitres
Colour	Flip Off
Customer Reviews	4.4 out of 5 stars 40 Reviews
Item Weight	0.18 Kilograms
Manufacturer	Ks-Tek
Material	PLA_(Polylactic_Acid), PC_(Polycarbonate), PTFE_(Polytetrafluoroethylene), aluminum
Number of Items	10
Product Care Instructions	Fridge Safe
Recommended Uses For Product	Laboratory Equipment
Reusability	Disposable
Shape	Round
Special Features	Aluminum Plastic Cover
Special feature	Aluminum Plastic Cover
UPC	761412564848
Unit Count	1.0 Count

Ks-Tek Sterile Empty Vials with Self Healing Injection Port,with Flip Off Aluminum Cap,Sterile Package (15ml,10)

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