Pentair 77707-0086 Stainless Steel Horizontal/Vertical Venting Positive Pressure Appliance Adapter Replacement Pool and Spa Heater Horizontal/vertical venting positive pressure appliance adapter Fits Pentair Sta-Rite Max-E-Therm pool and spa heaters Also fits Pentair MasterTemp pool and spa heaters Manufactured by Heat Fab Venting Made of stainless steel