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isetta

Onan CCKB oil drain plugs different size

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isetta

I have two CCKB engines. One in a Simplicity 4041 and the other is in a 9020. Looks like the older 4041 has an oil drain plug that measures a little over 5/8 outside diameter. The 9020 has a smaller, about 1/2 inch outside diameter plug. Does this sound like original equipment for these?

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