Lid knob kit, current style for Pure Water Distillers Part #WD610B. Mini Classic CT (2012 - Current), Steam Pure (2010 - Current), Midi Classic (1999- Current), Mega Classic (1998- Current), C-50 (1986 - Current), C-60/75 (1988-Current), Ultima Classic, Aqua Clean (1980-1987), Aqua D 2000 (1991-1998), 2000S, Aqua D Mark II (1985-1987), Aqua D Plus (1987-1988), Aqua Fountain (1970-1995), Aqua Still D (1981-1985), Aqua Still M5, Aqua Still M5D, Aqua Still M6, Aqua Still M6D, A-12 (1988-1991), Fountain Classic (2000-2006), Liberty Classic (2006-2009), MD-4 Aqua Clean (1987-1998), Midi D Auto (1991-1992), Midi D ECP (1992-1999), Midi D System (1990-1991), Midi SS-4, Midi SS-4D, Midi SS-5, Midi SS-5D, Midi Still (1981-1990), Midi Still D (1981-1990), Mini Classic 1 (1998-2001), Mini Classic 2 (2001-2012), Ultima 888 ((1995-1997), WATT'R Twin (1997-2000),