<p>A pressure/flow regulator includes a device having an input end that is connectable to a source of fluid, and an output end that is fluidly connected to a medical instrument. The device has a passage running from the input end to the output end to carry the fluid therethrough. A polymeric sleeve is disposed on the device. The polymeric sleeve covers at least one aperture that communicates with the passage. The polymeric sleeve has a resiliency capable of retaining the fluid within the at least one aperture until a predetermined pressure of the fluid within the aperture is attained at which point the sleeve deforms releasing pressure of the fluid within the device and preventing pressure damage to the medical instrument.</p>