6560-860, Sundance Spas - Jacuzzi Flow Switch Sundance Spas Flow Switch with Bypass 6560-860 Original Sundance Spa Parts. No generics Flow Switch with transparent tee 3/4" barb with a 3/8" barb off the side 3/4" barb replaces part # 6560-858 Flow Switch used on Sundance Spas 800/850/880 Series Spas, 1999 - Present