High Altitude Pressure Switch, For Use With Natural Or LP Gas, .41" WC PF, In Mfg Box, Made In USA, For Use With: UD-C-K0 And Later; DD-C-F0 And Later; UD-R-K0 And Later; DD-R-F0 And Later; UE-A-L0 And Later; DE-A-M0 And Later; CUB-A-C0 And Later; CDB-A-D0 And Later Product Lines.