Cylinders and any associated connections provided to you can be placed in the shipping container they were supplied in and returned. Please ensure you include the chain of custody and any other documentation associated with your samples.
Any commercial courier providers can be used to return cylinders for analysis and should be sent to:
Bureau Veritas Laboratories
Att: Air Quality.
6740 Campobello Rd.
Mississauga, Ontario. L5N 2L8.