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Intake filter O-ring for Coltri MCH13 and MCH16 compressors. Described by Coltri as "O-RING 3137 NBR 90SH (34,60X2,62) [O-RING 3137 NBR 90SH (34.60X2.62)]". Also fits oil filter O-ring for MCH36, final condensate separator cap to top plug O-ring (MCH36), top of 4th stage separator filter, and oil fill tube O-ring top and bottom (MCH13). For additional information on this part, see page 11 of MCH8-MCH23 Parts List located under the User Manuals tab.