Help with oil plug

Hey guys, had a tire blow out and the oil plug on my cat pump somehow came out, I have know idea what size to go back with I tried a 1 inch and 1 and 1/4 inch plug and it's between there. Might even be metric, I'll try to post some pics. Thanks
 

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CL Scott

New member
My cat pump 66DX40GG1 has an oil plug that's a British thread 1/4-19 BSP. What model pump is yours?
 
It does say cat pumps on the side, here's a pic of me attempting to measure, I'll try with some calibers tomorrow, thanks for trying to help bud
 

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