Hydroquip 4.5kW 230V 15  inch spa heater 26-0071A with 2 inch plumbing connections and 15 inch length.

Gecko Series, Water Pro, 2.25"x15", 4.5kW spa heater.

You may need pressure switch 3903

Used in select model Baja Spas, Gulf Coast Spas and by other hot tub manufacturers that used a particular HydroQuip spa pack.

26-0071A replaces HQP-851-9964 , 26-0071A,26-0071A-K heaters.

Does not come with heater tailpieces.  Need the tailpieces? See 2 inch heater tailpiece