The Flowtron replacement UV bulb starter is a handy spare part to always have with you. The bulb starter is important as it helps the UV bulb in your Bug Zapper start up and initiate the attraction to lure insects to the high-efficiency, non-clogging shocking grid. In case the bulb starter in your Bug Zapper fails for any reason, this replacement UV bulb starter will ensure you and your family will always be protected against mosquitoes and other insects. This is a 2-Pack, which gives the customer the price benefit who need multiple bulb starters This UV bulb starter is compatible with Flowtron BK-15D, BK-40D, BK-80D & MC-9000. Note: The bulb starter comes with a white tape stuck to it which must NOT be removed. Removing it will damage the starter and make it unusable. The starter can be used as it is (with the tape). The Flowtron Replacement UV Bulb Starter is an important component for the UV Bulb to keep working. The Flowtron Replacement UV Bulb is the main force of attraction for the insects. When the insects come near the bulb, depending on the mechanism of the bug zapper or fly killer, the insects either get zapped and are killed instantly by the nearby non-clogging, high-efficiency shock grid, or stick to the hidden, adhesive fly boards. The UV Bulb enables the Flowtron Bug Zapper and Fly Killer series of products to work continuously to ensure you and your family are safe at all times.