Self Level Drain Washer 6540-619 by Sundance Spas.

Used On Main Drain Suction Assemblies For 2005+ Sundance, 2003-2004 Sweetwater: 2005 850 Marin And Altamar (All Models), 2009+ 680 Series, 2011+ Elite Series, 2008 680 Burlington, Hartford, And Hawthorne. Also, 2001-2004 Sundance Luna/Tenon Inground.