Reply To: Remember Lipman?

He calls it a safeika d’dinah

Yes, as it would be if there were no beis din whatsoever involved in the tevila, because it’s a machlokes Rishonim if that works b’dieved (see Shulchan Aruch).

http://hebrewbooks.org/pdfpager.aspx?req=9147&st=&pgnum=193