The Aspire Nautilus Hollowed Out Stainless Steel Sleeve is the newest replacement tank for your Nautilus. Apire’s new clever design features a glass core tank with webbed stainless steel surrounding it. Eliminating the top and upper tube reduces the number of places the product could unscrew and leak. The Hollowed out Sleeve will replace the glass tank and the top cap on your original Nautilus tank. The Nautilus Hollowed out sleeve by Aspire is gorgeous as well as functional. The criss-cross stainless steel exterior not only offers great protection, but dresses up any mod!