MB® Replacement Seal Kit for Two Stage Heat Exchanger | 15 to 30 bbl MB® Replacement Seal Kit for Two Stage Heat Exchanger | 15 to 30 bbl Product form SKU: WC7150-SEAL $439.99 Quantity Add to cart Free Shipping on orders over $79 This item ships freight only. This item is not eligible for sitewide price reductions or percentage discounts. This item is available for Pre-Order. Full payment is required to reserve stock.