it would be cheaper to just get a compressor.
most cylinders are rented at a cost of about £50/yr for a 10ltr cylinder, you could buy the cylinder but then you become responsible for the testing which unless you have the facilities is often more expensive than renting.
refills for synthetic air is relatively cheep as you dont require calibration certification
regulators are a bit of a kiler normally £100+ think the ones i have at work are in the region of £800 each then once again testing on top
you would also need to look into car insurance as some companies wouldn't cover you others just place restrictions on the size and how they should be transported, hence the reason i can only carry 2ltr cylinders for work in the car but can carry 20ltr cylinders if i use the van.
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