Aso Float Kit

Q: I need to order the proper fitting float for the 2- 30 gallon tanks I ordered from you that will fit my 4 stage R/O system, I ordered 2 float valve , standard mount fixed arm 1.5 gpm at 60 psi1/4 inch NPT male and it is to big for the hole you drilled and I cannot screw the tubing fitting on to it? Please advise? Sincerely Vincent O'Connor ###-###-####