You can look for 2mm thick silicone rubber,Usually white and translucent,Make a 1.5 x 7.0 (mm) ring,Instead use.
It looks like it is used here to regulate flow,You can adjust the flow rate by adjusting the large nut cap A
![[Linked Image]](https://www.ebme.co.uk/forums/ubbthreads.php/ubb/download/Number/916/filename/11.jpg)
After assembly, recalibrate the pressure value at the output of the pressure reducing valve
I remember the Stryker 40L Highflow Insufflator, there is a service manual on the Internet, you can follow the manual to do the pressure calibration, which may take some time, there are detailed steps.
Hope your pressure sensor is not damaged, good luck
