An inflation hose is used to connect the spa pump to the inflatable liner on your Lay-Z-Spa. This enables you to automatically inflate your Lay-Z-Spa using the pump's massage function setting. This hose is designed for use with most AirJet hot tub models.. Replacement Lay-Z-Spa Inflation Hose. Enables you to automatically inflate your Lay-Z-Spa. Compatible with most AirJet hot tubs. Connects the heater pump to your Lay-Z-Spa liner | Lay-Z-Spa Bestway Black Inflation Hose For Most AirJet Spas