Will a 25inch oxygen bottle fit

No. It is made for M6 oxygen tanks that are about 16 inches tall. It is perfect for that.

will fit size A, B and C size cylinder?

it fits c perfect, i don’t know how big a n b are

What is the diameter of thr grommet holes?

The diameter of the actual open area of each grommet is 3/4".

does bag come with Oxygen Cylinder Wrench?

Sorry, the oxygen backpack does not include a cylinder wrench, but we have a wrench for sale in our store. If you are interested, please clink the link about cylinder wrench: https://www.amazon.com/dp/B08DHSXTRR?ref=myi_title_dp

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Oxygen tank backpack (S)

Product ID: 228995182

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🎒Fits M2 to M9 tanks

💨6 outlet holes for ventilation

🛡️Reinforced bottom & rubber feet

Description

🎒 Carry Confidence, Breathe Easy – Wherever Life Takes You!

SECURE STABLE CARRY - Hard plastic base and 4 rubber feet keep your oxygen cylinder firmly in place, no wobble guaranteed.
SMART STORAGE SOLUTIONS - Two zippered front pouches provide easy access to essential small equipment on the go.
ERGONOMIC COMFORT DESIGN - Extended padded air mesh straps with adjustable chest straps ensure all-day comfort and balanced weight distribution.
DURABLE BREATHABLE BUILD - Reinforced bottom and breathable padded back protect your tank while enhancing airflow during travel.
UNIVERSAL TANK COMPATIBILITY - Seamlessly fits M2, M4(A), M6(B), ML6, M7, and M9(C) sizes for ultimate versatility.

This sleek black oxygen tank backpack is engineered to fit multiple tank sizes (M2 to M9), featuring reinforced bottoms, breathable padded straps, and secure fastening systems. Designed for professional and active users, it offers ergonomic comfort, stable tank placement, and smart storage, making it the ultimate travel companion for oxygen therapy on the move.

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