Check the listing for details. 6 Spoke Graphite Gray Knob, Cap & O-Ring Kit, Waterfall, 1", Master Spa Twilight. Condition: New. Listed at 29.99 USD. This item is a 6 SPoke Divert Knob, Diverter Cap and O-ring Kit for a 1" Waterfall or Neck Jet Control.. The inside thread measurement is about 1 5/8" and the center hole is about 3/4".. It uses (2) Small o-rings and one O-Ring Gasket that measures about 1 1/2" center to center..Compare the measurements to be sure this is correct. handle, cap, knob, 602-3739-DSG, 602-3610, 602-0960, orings, o-rings, diverter, valve, X245375, Master Spa , 245375 , 2 inch, DSG ,6-Spoke ,Diverter ,Assembly , 2009+, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2012, 2022, 2023, 2024, Master Spas, Twilight Series, Diverter Valve Kit, Stem, Cap ,6-Spoke Handle, Hot Tub, 2009 and later, 602-4549, 602-4360, wate4fall control. waterfall valve,