Heater Return Assembly, All 2004-2005 Models Except Solo (Use Parts 4-9 & 10-12) Heater Return Assembly, 2001-03 (Parts 1-9) 1A. 6540-291, Accu-Return Wall Fitting (All 2002-03 models except Solo) 1B. 6540-694, Accu-Return Wall Fitting (2002-2005 Solo Only) 1C. 6540-731, Accu-Return Wall Fitting (All 2001 Models) 2. 6540-685, Accu-Pressure Nut 3. 6540-682, O-Ring (2 required) 4. 6540-827, Adapter, 0.75” Slip x 0.75” Barb (All 2002+ Models) 5. 6540-042, 90° Elbow, 0.75” Slip x 0.75” Barb (All 2001 Models) 6. 6570-033, Clamp, 27mm 7. 6540-744, 0.75” Clear Hose Ordered by the foot) 8. 6570-099, Metal Hose Clamp 9. 6540-727, Ozone Mixing Chamber (All 2002-2004 Models Except Solo) 10. 6540-979, Gravity Drain with Cover 11. 6540-682, Gravity Drain O-Ring 12. 6540-685, Gravity Drain Fitting Locknut