See appropriate parts diagram for call-out

• Remove valve body screw (8) and remove entire valve module.
• Separate diaphragm (14) from plastic valve corner plate (12) and pull away
  swing (16) with diaphragm.
• Unscrew diaphragm bolt (15) and replace diaphragm (14). Replace bolt (15).
  

FOR OPTIMA ONLY replace metal "noise eliminator" housing (21) replace rheostat circuit (24) and plastic rheostat cover (23). screw in "noise eliminator" housing screws (21). Ensure alignment of air outlet (1) with case. Close pump housing (2 and 3). Screw bottom screws (4) into housing.