650 delta gas valve ap15255d 650 delta ap15255d 650 delta gas valve 650 delta ap15255a-1 gas regulator 650 delta ap15255a-1 rheem water heater gas valve 650 delta 650 delta ap15255b 650 delta ap15255b-1 650 delta ap15255b-1 rev 2 650 delta ap15255a-1