... casting feed frameType:P504A-BV1.0/1.2 P means plastic feed frame,casting feed frame without "P"504 is the code for ... wire feed frame we have 21,401,402,404,501,502,504,P504 ... /1.0,1.0/1.2,1.2/1.6,1.6/2.0,2.0/2.4the drawing of the P504A: Plastic casting feed frame