PMI recommends keeping a spare orifice available. Graphite Ferrules, Quartz Wool Filter and Filter Screens will be needed for routine maintenance. Following is a list of parts with part numbers for ordering purposes. Part # EPM # Description PMI3120* 2126.064 Glass Orifice, 20 ml/min. PMI3150* 2126.047 Glass Orifice, 50 ml/min. PMI3190 2126.081 Quartz Wool Filter, 10g PMI3199 2149.020 Ferrule, Graphite, Box of 10 PMI3113 0042.206 Filter Screen PMI3119 N/A Anti-seize Compound PMI3186 2126.232 Inline Filter, 60 micron PMI3187 2126.227 Element, Filter, 60 micron PMI3182 0041.108 End Cap Assy. (3 piece) PMI3115 0041.051 End Cap Assy (2 piece) PMI3183 0040.250 Mantle PMI3184 0041.110 End Cap * Orifices are available in a range of sizes from 20 ml/min to 500 ml/min.