What size of the steel tube that goes into the connection??

The plated tube is .548" outside diameter 1.750" between the body and the nut. In metric 14 mm outside Diameter The plating may have added several thousands to the pre plating diameter. I cannot see enough of the threading into the body to tell the thread size, but suspect it is metric probably made in China. Hope that helps Richard

Instructions that came with the unit says to make sure the "sealing washer is in place on the yoke inlet." no washer shipped - is it required?

no washer needed it should be the brass nipple on the regulator connected to the brass cylinder valve

What size is the hose barb on this reg?

It looks to be about a 3/16" Hose barb.

Does this fit the disposable o2 tanks sold in places like home depot? thanks...

It uses CGA540 Connector Type. Don't know if those are sold at HD. I bet not.

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Medline Best Valued Mini Oxygen Regulator, 0-8LPM, 540 CGA Connector, Brass Sleeve

Product ID: 13858481

Details

Brand
Medline
Filter Class
HPS
Material
Brass Sleeve
Number of Items
1
Size
One Size

Description

HPIS Classification : 680_330_60_0
Latex Free
UNSPSC code42271707

Product Description These low cost regulators are fitted with a brass sleeve around key parts. All regulators are laser etched to eliminate flaking and rub-off. Test method for evaluating the ignition. Sensitivity and fault tolerance of oxygen. Regulators for all medical and emergency applications. Manufacturer Contact Information 1-800-633-5463

Specifications

ASIN	B00BLQKI86
Best Sellers Rank	#602,352 in Health & Household ( See Top 100 in Health & Household ) #1,353 in Oxygen Accessories
Brand	Medline
Brand Name	Medline
Customer Reviews	4.5 out of 5 stars 189 Reviews
Filter Class	HPS
Global Trade Identification Number	10080196226504
Item Package Quantity	1
Item Weight	3.68 ounces
Manufacturer	Medline Industries Healthcare
Manufacturer Contact Information	1-800-633-5463
Material	Brass Sleeve
Number of Items	1
Part Number	HCS5408M
Product Style	Modern
Reusability	Reusable
Size	One Size
Special Feature	Latex free
Special Features	Latex free
Style Number	HCS5408M
Unit Count	1 Count

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