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

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

Product ID: 99516844

Details

Brand
Ever Ready Aid
Material
Aluminum Brass
Number of Items
1
Thread Type
Cga-870
Unit Count
1.0 Count

📏Compact 4.5" x 2.5" x 1.25" size

⚙️12 preset flow settings 0-15 LPM

🛠️Includes durable oxygen key with chain

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€ 53.55

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Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🩺 Stay ready, stay safe — oxygen control that fits your fast-paced life.

SPACE SMART DESIGN - Compact footprint ensures your oxygen tank stays sleek and manageable on the go.
ALL IN ONE CONVENIENCE - Comes with a handy oxygen key attached by chain—always ready when you are.
LIGHTWEIGHT DURABILITY - Crafted from anodized aluminum and brass for a robust yet portable regulator.
PRECISION FLOW CONTROL - Easily dial through 12 preset flow rates for tailored oxygen delivery up to 15 LPM.
SECURE TUBING CONNECTION - Single barb outlet guarantees leak-free, reliable tubing attachment every time.

The Ever Ready First Aid Oxygen Regulator CGA-870 is a compact, lightweight device designed for oxygen tanks up to 2000 PSI. Featuring 12 adjustable flow settings from 0 to 15 LPM, it ensures precise oxygen delivery. Made from durable anodized aluminum and brass, it includes a secure single barb outlet and a convenient oxygen key with chain for easy cylinder access, making it an essential accessory for reliable respiratory care.

Specifications

ASIN	B07MFR94DP
Best Sellers Rank	#102,957 in Health & Household ( See Top 100 in Health & Household ) #121 in Oxygen Accessories
Brand Name	Ever Ready First Aid
Customer Reviews	4.6 4.6 out of 5 stars (1,692)
Manufacturer	Ever Ready First Aid
Material Type	Aluminum, Brass
Model	BD16549
Part Number	BD16549
Thread Style	Cga-870
UPC	843484102002
Unit Count	1.0 Count

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