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Novarossi O-Ring Kit for Carburetor
This is a replacement O-ring set for the Novorossi family of .21 engines, including the P5, 421B, T21BF, BS-21SB and the Novarossi 528XR and 528XS. This will work with any Novarossi brand engine including the Top and Rex lines. This O-ring set comes with a replacement slide carb boot, along with a number of high and low speed O-rings for the needle assembly.