Specifically designed for the Milan AirJet plus (2021) This Lay Z Spa Milan Airjet Inflatable Body is the direct replacement to your original Milan lay z spa, after years of wear and tear or after a dreaded puncture. The liner is the inner section of the lay-z spa, filled with water that connects to the heated pump while also containing the integrated massage jets that provide a relaxing spa experience. Please Note: This is not a full Lay Z Spa, this is the inflatable body of the spa only. Please Note: This is a Lay-Z-Spa Milan liner which has buckles to secure the inflatable lid and top cover. Unless your Lay-Z-Spar Milan top cover has buckles, you won’t be able to secure it to this liner.