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Under factory testing, our diaphragms last on the order of 1 million cycles. While this may seem like a lot of cycles, keep in mind that a pump running 24/7 at 72 rpm will reach one million cycles in a little over 10 days!
Under operating conditions in which the pump is generating significant positive or negative pressure (i.e., vacuum), diaphragm life may be shortened. Additionally, the choice of diaphragm material will affect diaphragm lifetime. The standard diaphragm we recommend for many applications is Buna-Nitrile, which has much better mechanical properties (e.g. tear resistance) than, say, silicone (our white diaphragm). (Additionally, the Buna-Nitrile in our diaphragm is an FDA-approved material.) You should inspect your Guzzler on a regular basis to look for signs of wear and tear on your pump diaphragm and its components.