What size fitting does the hose barb have?

The same standard size used for all oxygen breathing equipment.

Does this read 1/4 1/32 in LPM?

I think the lowest flow rate is 0.5 lpm.

can a humidifier be connected ?

https://www.amazon.com/KANGneei-Oxygen-Bubbler-Bottle-Concentrator/dp/B094DP455X/ref=sr_1_24?crid=2TQ7NTTKZ3PJB&dchild=1&keywords=oxygen+humidifier+bottle&qid=1621964450&sprefix=oxygen+hu%2Caps%2C183&sr=8-24

Ot says the flow rate can be adjusted in 12 steps from 0. Does it have steps less than 1 Lpm such as .5 .25 etc? Thanks

I think so . if you need .5 you likely do not need O2.

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💨 Breathe easy, stay ready — oxygen control that fits your fast-paced life!

SECURE CONNECTION - Single barb outlet ensures leak-free tubing attachment every time
COMPACT PORTABLE - Slim 4.5" x 2.5" x 1.25" design keeps your oxygen setup sleek and manageable
READY WHEN YOU ARE - Includes a durable oxygen key with chain for instant cylinder access
LIGHTWEIGHT DURABILITY - Crafted from anodized aluminum and brass for strength without bulk
PRECISION FLOW CONTROL - 12 adjustable flow rates from 0 to 15 LPM for tailored oxygen delivery

The Ever Ready First Aid Oxygen Regulator CGA-870 is a compact, lightweight device engineered for precise oxygen flow control up to 15 LPM. Made from anodized aluminum and brass, it fits any CGA 870 oxygen tank up to 2000 PSI. Featuring 12 preset flow settings, a secure single barb outlet, and an included oxygen key with chain, it’s designed for professionals who demand reliability and portability in respiratory care.

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Manufacturer	Ever Ready First Aid
Part number	BD16549
Item Weight	316 g
Package Dimensions	13.04 x 7.7 x 6.71 cm; 315.5 g
Item model number	BD16549
Size	4.5" x 2.5" x 1.25"
Colour	Green
Material	Aluminium, Brass
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No

Ever Ready First Aid Oxygen Regulator CGA-870 Gauge Flow Rate with Wrench Key - 0-15LPM

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