Preventative maintenance is the regular activity performed on a piece of equipment to lessen the likelihood of failing. Logic dictates that the probability of a failure is dependent on how well something is designed and constructed in combination with the frequency of use in a given environment. However, there is no preventative maintenance required on a Boehringer Suction Regulator. As long as you don’t suction bodily fluids through it, you can count on the regulator functioning until you retire.