Bluezone Replacement Bulb for VBI/FBI Refrigeration Models - RBZB7(P)(B) *Please check model # on serial tag, if it ends with 00 and the bulb is installed horizontal, this is the correct replacement bulb.* ( B)( P) (P)Ensure clean air and freshness in your refrigerator with a Viking Bluezone Replacement Bulb subscription. Order individual Bluezone bulbs or signup for our automatic replenishment program and receive your Bluezone Replacement Bulb automatically every 6 months. (For the VBI FBI Refrigeration it is