OTTO Excavator Spare Parts Nhr 4Ja1 Oil Filler Cap 8941097910 894109-7910 8-94109791-0 For Isuzu This OTTO Excavator Spare Part is an oil filler cap designed for the NHR 4JA1 engine by Isuzu. It is labeled as 8941097910, 894109-7910, and 8-94109791-0.