The AquaThunder® Jet Housing, specifically designed for use with the ATFxxx model jet fitting, is a key component for setting up a spa jet system. Constructed from durable PVC, this housing is engineered to endure the conditions of spa environments, providing both functionality and durability. It includes separate water and air tubes to cater to various jet experiences. Note that the AquaThunder® Jet Housing and the ATFxxx model are sold separately, emphasizing the need for the ATFxxx for a complete installation process.