The Lock-Top Damper combines service, experience, and expertise to offer unparalleled results in saving money, time, and frustration in chimney energy conservation. It is designed to lock bad weather, pests, and unconditioned air outside, and keep clean, conditioned air inside. Lock-Top is the low cost solution to replacing rusted, worn-out, energy leaking throat dampers and can dramatically reduces noise from outside... Retails for 330.00