Cal Spa Diverter Valve Kit O-Rings Cap & Teardrop Knob Hot Tub How To Video Kit includes Cap, Teardrop Knob & O-Rings 3 7/8" Teardrop Knob Cal Spa Diverter Valve 3 1/2" Buttress Style Cap See Our You Tube Video about this Part 2 3/4" Thread Width