Genuine Hot Spring Spa E5 Circulation Pump, 74427 Watkins Tiger River Caldera. Brand new Genuine OEM E5 Pump for use in all Hot Spring Spas, Caldera, Tiger River, Hot Spot tubs tha have a 24hr Circulation Pump. The NEW E5 replaces the Watkins SilentFlo® 5000 and Silentflo 5002 circ pumps on all Hot Spring and Tiger River spa models from 1986 to Current This pump is exceptionally energy efficient.
