The gray marble liner is a replacement part for SaluSpa Carrara AirJet Hot Tubs. This external liner is compatible with your ThermaCore foam AirJet hot tub, with jets around the bottom of the tub that will surround you with a relaxing bubble massage and target your feet and back. The liner is constructed with 3-layer Tritech material, proven to be both puncture and damage resistant. This replacement part only includes the outer liner for your hot tub. If you need the complete set, you’ll also need a foam wall piece (P08127 – multiple may be needed) or a foam pump piece (P08126).