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Replacement Bottle of Calibration Gas from Portagas
Size: 100 Liter
Concentration: 100 ppm isobutylene with an AIR balance (Please let us know if you need a different concentration at check out)
Shelf Life: 24 Months
These are the Special “PortaGreen” Refillable Cylinders. It even includes a return shipping label.
PortaGreen provides a hassle free cylinder return program designed to reduce HAZMAT costs and your carbon footprint.
Here is a link to learn more. http://www.portagas.com/products/portagreen/