2PCS AN3 AN4 AN6 AN8 AN10 AN12 AN16 AN20 Female to Male Reducer Fitting Adaptor
Size - The Adapter is a 4AN female to 3AN male. The thread size of the 4AN is 7/16-20 UNF. The thread size of the 3AN is 3/8-24 UNF. Size - The Adapter is a 6AN female to 4AN male. The thread size of the 6AN is 9/16-18 UNF.