Be sure to look at your old rheostat on side of ceramic to see what your ohms are. There are two versions for the 225Nt, be sure you order the right one.
This one is 10 OHMS.
 
My other listing has the 14ohm.
BRAND NEW!   
Miller Welder Rheostat, 100 Watt, 10 Ohm, 205839 & Supersedes 117243, Bobcat 225G 225G Plus,  225D, 225D Plus, 225Nt Prior to Lc191442

Ships from High Speed Engineering Dallas Oregon