UNDER WATER WORKS
Most modern dive gear is manufactured according the highest standards and by using quality materials. However dive gear eventually wears out and will not last forever.
It is imperative for your and your dive buddy's safety that you inspect your dive gear an a regular basis, best before every dive.
Regular checks, maintenance and service will keep your gear in good condition and will prolongs it's lifespan. If in doubt get your gear checked and serviced by an authorised technician.
O-rings and spare parts are easy to replace, a human life is not.