Product details:

Weil Mclain 383-500-665 Control Module For Ultra Gas Boiler Models Ultra 80, 105, 155, 233Ultra Series 1 and 2 U-Control Upgrade Kit.For use with Ultra Gas Fired water boilers - Series 3.Replaces: 383-500-190, Honeywell MCBA14A1004, MCBA14201D, Weil Mclain 511-330-257, 511330257 (When Not Being Used In High Altitude Areas), 383500190, Grainger 40LZ40