Is it permissible to sell fire extinguishers with an expiration date of five years printed on the canister, knowing that their actual shelf life does not exceed two years, and is it sufficient to inform the wholesaler of this?

There is no doubt that cheating and harming people by manipulating product expiration dates is forbidden. As for selling a product with an error in the recorded expiration date, its ruling depends on the possibility of informing the consumer of the truth. If the buyer knows the correct date and buys the product to benefit from it, then there is no harm in selling it to him, provided that deception and fraud are removed. Similarly, it is permissible to sell it to an honest merchant who will clarify the situation to anyone who buys from him. The decisive factor is the removal of deception and harm. Therefore, the product importer should not sell it before correcting the expiration date to the true date.