Make sure the product you are going to buy in quality has been tested. The feasibility test of fire extinguishers usually carried out by related agencies, in this case, is the Fire Service. If the tube you are going to buy is tested, is it feasible to use the tube when needed? not necessarily. Because there are several factors that support whether the fire extinguisher that you have purchased will function optimally? In order for the tube that you buy to function and be optimally useful, you need to understand the second stage you must understand. Apart from that, if you still want to know more about fire extinguishers, perhaps you need to check out the fire extinguisher hydrostatic testing.
Then, make sure the tube has clear usage instructions, and that no less important you must understand the instructions printed on the tube properly and correctly because the extinguisher will not mean anything if you do not know how to use it. It is a good idea to get information from the seller on how to use the fire extinguisher that you have purchased. These two things are still not enough, because of the two things you have to get good service from the supplier, what service is meant?