Pressure relief Valve kit pn# 002-1197-00
This Midmark Ritter Autoclave Part Fits:
M9-020 thru -022 with Serial # prefixes RN, RP, RR & V
M9D-020 thru -022 with Serial # prefixes RW, RX & V
M11-020 thru -022 with Serial # prefixes RS, RT, RV & V
M11D-020 thru -022 with Serial # prefixes RY, RZ & V