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
Are batteries included?	No
Best Sellers Rank	#56,791 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #53 in Lab Sample Vials
Bottle Type	Glass Bottle
Brand	Ks-Tek
Capacity	10 Milliliters
Country of Origin	USA
Customer Reviews	4.6 4.6 out of 5 stars (1,149)
Date First Available	24 June 2021
Item Dimensions LxWxH	22 x 22 x 50 Millimeters
Item Height	1.96 Inches
Item Weight	150 g
Item Width	0.86 Inches
Item model number	KSUS-SEV-M
Manufacturer	Ks-Tek
Material	aluminum
Model number	KSUS-SEV-M
Number of Items	10
Number of Packs	10
Product Care Instructions	Hand Wash Only, Store in a cool, dry place, Avoid high temperatures
Product Dimensions	2.18 x 2.18 x 4.98 cm; 150 g
Recommended Uses For Product	Medical/Laboratory use
Reusability	Reusable
Shape	Round
Special Feature	Self Healing Injection Port, Flip Off Aluminum Cap
UPC	761412815841

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

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