You can find victa fuel tap o rings online that work with this fuel tap or a universal oring kit should have the sizes you need.
https://www.ebay.com.au/itm/353032283886?hash=item52325d26ee:g:C7MAAOSwv7pehSow&amdata=enc%3AAQAHAAAAoB9pQD8OKaQkVxDwbjoniqntSstI3DP88RcbpIX46pbqcgAtdwC2jBVSZP2Zofh0DQ5%2BsCmRRIkeeglfOkVHT5ikD7Vu9oqqCJO6zy94ubFTVFS%2Bcw2GSbIVh3TkbScb6TBWA9cGMC0X3MhINH2m7m3xqLx5tumUN15xlcQS%2BpoyJQm%2FjuLy2%2FvMUE2oJ2m%2F0cjgpOTwDZPr4tLz0e7Je7E%3D%7Ctkp%3ABk9SR5zxjMSAYQ
