Check the listing for details. 1044101 Hot Spring Spas Ozone Check Valve. Condition: New. Listed at 25.59 USD. Over time the ozonator check valves can break down causing backflow of water and not creating bubbles (the ozone injection process)Replaces #34658 3/16" valves Ozone Check Valve is for the following models. Make ModelDate RangeHot SpringGrandee1995-CurrentHot SpringVista 2004-2013Hot SpringEnvoy2004-CurrentHot SpringVanguard2001-CurrentHot SpringGrandee NXT2014-CurrentHot SpringEnvoy NXT2014-CurrentHot SpringJetsetter NXT2014-CurrentHot SpringJetsetter2014-CurrentHot SpringProdigy1995-CurrentHot SpringSovereign1995-CurrentHot SpringAlccolade2005-2006Hot SpringLandmark1996-2003Hot SpringAria2007-CurrentTiger RiverBengal1997-2010Tiger RiverSiberian1997-2004Tiger RiverCaspian2003-2010Tiger RiverSummatran1997-2010Tiger RiverBengal Model MM2005-2010Hot SpotRLX1998-2002Hot SpotSLX1998-2002Hot SpotSX2011-CurrentHot SpotTX2011-CurrentHot SpotRound1995-1997Hot SpotSLXtra2001-2002Hot SpotRE1998-2002Hot SpotSE1998-2000CalderaTahitian2001-CurrentCalderaNiagara2001-CurrentCalderaGeneva2001-CurrentCalderaCantabria2009-CurrentCalderaHawaiian2002-2010CalderaKauai2013-2015CalderaMoorea2006-2010CalderaSalina2011-2015CalderaMakena2013-2015CalderaMartinique2013-2015CalderaAspire2004-2008CalderaElation2003-2010