This is the Part Number for the Newer Style 16978 Type Unit (The 16978 Should Interchange, But We are Breaking Out the 17263 For Better Application Information). These are Comprised of PIC No. 190-229B (Original Lester No. 17263 or 17482), 190-229C (Original Lester No. 17404), and 190-229D (Original Lester No. 17400). These Units are all 1.4Kw, and Virtually Identical to Each Other.