The Lid Tight® Dome Clamp is designed to lock down the dome lids on the MC 306 and DOT 406 tank trucks. When these fuel haulers roll over, product can leak from their dome lids. The Lid Tight® dome clamps spread over the width of the dome lid and lock down the lid, preventing any further release of product. Lid Tight® are lightweight and lock into place quickly and easily. Trucking companies, fire departments and environmental contractors are the customers for this product.